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5x + 2 - 8x + 4 = -3 / -6
13x = -9 / ÷13
x = -9/13
b) 1/3x - (4 + 1/2x) = -2
1/3x - 4 - 1/2x = -2 / +4
-1/6x = 2 / ·6
-x = 12 / ·(-1)
x = -12
c) (x-3)/2 = (x+1)/3 / ·6
3(x-3) = 2(x+1)
3x - 9 = 2x + 2 / + 9 - 2x
5x = 11
x = 2,2
d) 5x(x-2) -x(5x-2) = -4
5x² - 10x - 5x² + 2x = -4
-8x = -4
x = 1/2