8) 3x-2(3x-2)=19

Привет! Давай решим эти уравнения по твоему образцу: раскрываем скобки, переносим слагаемые и находим $x$. 8) $3x - 2(3x - 2) = 19$ $3x - 6x + 4 = 19$ $-3x + 4 = 19$ $-3x = 19 - 4$ $-3x = 15$ $x = 15 : (-3)$ $x = -5$ 9) $-4x = 15 - 3(3x - 5)$ $-4x = 15 - 9x + 15$ $-4x = -9x + 30$ $-4x + 9x = 30$ $5x = 30$ $x = 6$ 10) $-7x = 13 - 2(8x - 7)$ $-7x = 13 - 16x + 14$ $-7x = -16x + 27$ $-7x + 16x = 27$ $9x = 27$ $x = 3$ 11) $-5x = 11 - 2(4x - 2)$ $-5x = 11 - 8x + 4$ $-5x = -8x + 15$ $-5x + 8x = 15$ $3x = 15$ $x = 5$ 12) $7 - 3(5x - 3) = -11x$ $7 - 15x + 9 = -11x$ $16 - 15x = -11x$ $16 = -11x + 15x$ $16 = 4x$ $x = 4$ 13) $16 - 7(5 - x) = 9$ $16 - 35 + 7x = 9$ $-19 + 7x = 9$ $7x = 9 + 19$ $7x = 28$ $x = 4$ 14) $13 - 6(3 - x) = 25$ $13 - 18 + 6x = 25$ $-5 + 6x = 25$ $6x = 25 + 5$ $6x = 30$ $x = 5$ 15) $12 - 8(4 - x) = 4$ $12 - 32 + 8x = 4$ $-20 + 8x = 4$ $8x = 4 + 20$ $8x = 24$ $x = 3$ 16) $15 - 4(7 - x) = 11$ $15 - 28 + 4x = 11$ $-13 + 4x = 11$ $4x = 11 + 13$ $4x = 24$ $x = 6$ 17) $6 - 5(4x - 1) = 3$ $6 - 20x + 5 = 3$ $11 - 20x = 3$ $-20x = 3 - 11$ $-20x = -8$ $x = -8 / -20$ $x = 0,4$