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x in (-oo:+oo)
-18 = x/3+2 // - x/3+2
-(x/3)-18-2 = 0
-1/3*x-20 = 0 // + 20
-1/3*x = 20 // : -1/3
x = 20/(-1/3)
x = -60
x = -60
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