Чему равен корень уравнения: 1) 3x = 28 - x; 2) 5x + 12 = 8x + 30; 3) 33 + 8x = -5x + 72

1. Чему равен корень уравнения: 1) $3x = 28 - x$ $\rightarrow$ $4x = 28$ $\rightarrow$ $x = 7$ 2) $5x + 12 = 8x + 30$ $\rightarrow$ $-3x = 18$ $\rightarrow$ $x = -6$ 3) $33 + 8x = -5x + 72$ $\rightarrow$ $13x = 39$ $\rightarrow$ $x = 3$ 4) $6x - 19 = -x - 10$ $\rightarrow$ $7x = 9$ $\rightarrow$ $x = \frac{9}{7} = 1\frac{2}{7}$ 5) $0,7 - 0,2x = 0,3x - 1,8$ $\rightarrow$ $-0,5x = -2,5$ $\rightarrow$ $x = 5$ 6) $0,1x + 9 = 0,2x - 4$ $\rightarrow$ $-0,1x = -13$ $\rightarrow$ $x = 130$ 2. Решите уравнение: 1) $-6(x + 2) = 4x - 17$ $\rightarrow$ $-6x - 12 = 4x - 17$ $\rightarrow$ $-10x = -5$ $\rightarrow$ $x = 0,5$ 2) $(18x - 19) - (4 - 7x) = -73$ $\rightarrow$ $18x - 19 - 4 + 7x = -73$ $\rightarrow$ $25x = -50$ $\rightarrow$ $x = -2$ 3) $10x + 3(7 - 2x) = 13 + 2x$ $\rightarrow$ $10x + 21 - 6x = 13 + 2x$ $\rightarrow$ $2x = -8$ $\rightarrow$ $x = -4$ 4) $-3(4 - 5y) + 2(3 - 6y) = -3,9$ $\rightarrow$ $-12 + 15y + 6 - 12y = -3,9$ $\rightarrow$ $3y = 2,1$ $\rightarrow$ $y = 0,7$ 3. Найдите корень уравнения: 1) $9(x - 1) = x + 15$ $\rightarrow$ $9x - 9 = x + 15$ $\rightarrow$ $8x = 24$ $\rightarrow$ $x = 3$ 2) $(11x + 14) - (5x - 8) = 25$ $\rightarrow$ $11x + 14 - 5x + 8 = 25$ $\rightarrow$ $6x = 3$ $\rightarrow$ $x = 0,5$ 3) $12 - 4(x - 3) = 39 - 9x$ $\rightarrow$ $12 - 4x + 12 = 39 - 9x$ $\rightarrow$ $5x = 15$ $\rightarrow$ $x = 3$ 4) $2(3x + 5) - 3(4x - 1) = 11,8$ $\rightarrow$ $6x + 10 - 12x + 3 = 11,8$ $\rightarrow$ $-6x = -1,2$ $\rightarrow$ $x = 0,2$ 4. Решите уравнение: 1) $0,8(4x + 5) = -3,2$ $\rightarrow$ $3,2x + 4 = -3,2$ $\rightarrow$ $3,2x = -7,2$ $\rightarrow$ $x = -2,25$ 2) $-2,4(7 - 9y) = -48$ $\rightarrow$ $7 - 9y = 20$ $\rightarrow$ $-9y = 13$ $\rightarrow$ $y = -\frac{13}{9} = -1\frac{4}{9}$