9 16/51 + 2x = 4 11/34

а) $2x = 4\frac{11}{34} - 9\frac{16}{51} = \frac{147}{34} - \frac{475}{51} = \frac{441 - 950}{102} = -\frac{509}{102}$; $x = -\frac{509}{204} = -2\frac{101}{204}$ б) $3z = 7\frac{5}{39} - 2\frac{11}{52} = \frac{278}{39} - \frac{115}{52} = \frac{1112 - 345}{156} = \frac{767}{156}$; $z = \frac{767}{468} = 1\frac{299}{468}$ в) $1y - 0,4 - 0,6y + 0,3 = -0,9 \implies 0,4y - 0,1 = -0,9 \implies 0,4y = -0,8 \implies y = -2$ г) $1,5x - 2,1 - 0,6x - 9,6 = 0 \implies 0,9x - 11,7 = 0 \implies 0,9x = 11,7 \implies x = 13$ д) $1,2x + 21 - 3,2x + 12 = 2 \implies -2x + 33 = 2 \implies -2x = -31 \implies x = 15,5$ е) $0,7x - 0,8x = 3,46 + 1,82 \implies -0,1x = 5,28 \implies x = -52,8$ ё) $-3x = 5\frac{9}{26} + 8\frac{7}{39} = \frac{139}{26} + \frac{319}{39} = \frac{417 + 638}{78} = \frac{1055}{78}$; $x = -\frac{1055}{234} = -4\frac{119}{234}$ ж) $\frac{2}{14}x + \frac{3}{14}x = 14 \implies \frac{5}{14}x = 14 \implies x = \frac{196}{5} = 39,2$ з) $3,6 - 3x = 1,2 \implies -3x = -2,4 \implies x = 0,8$ и) $4,72 - 4,5x = 2,92 \implies -4,5x = -1,8 \implies x = \frac{1,8}{4,5} = 0,4$ к) $4 - 2a + 6 + 4a = 0 \implies 2a + 10 = 0 \implies 2a = -10 \implies a = -5$ л) $12 - 8x - 6 - 4x = -24 \implies 6 - 12x = -24 \implies -12x = -30 \implies x = 2,5$