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x in (-oo:+oo)
-(5*x)-6 = 4*x+12 // - 4*x+12
-(5*x)-(4*x)-12-6 = 0
-5*x-4*x-12-6 = 0
-9*x-18 = 0 // + 18
-9*x = 18 // : -9
x = 18/(-9)
x = -2
x = -2
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