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x in (-oo:+oo)
-(3*x)-9 = -45 // + 45
45-(3*x)-9 = 0
45-3*x-9 = 0
36-3*x = 0 // - 36
-3*x = -36 // : -3
x = -36/(-3)
x = 12
x = 12
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