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x in (-oo:+oo)
-3 = x/6+12 // - x/6+12
-(x/6)-12-3 = 0
-1/6*x-15 = 0 // + 15
-1/6*x = 15 // : -1/6
x = 15/(-1/6)
x = -90
x = -90
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