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-5x-7x=8-3
-12x=5
x=-
b)6(x+4)=-3(-2x-5)
6x+24=6x+15
6x+6x=15-24
12x=-7
x=-
c)(x-3)²- (x+5)² = -2
x² - 6x +9 -x² -10x - 25 = -2
x² - x² -6x - 10x +9 - 25 = -2
-16x = -2 -9 +25
-16x = 14
x = -
x = -