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x in (-oo:+oo)
-18 = (-1/2)*x // - (-1/2)*x
-((-1/2)*x)-18 = 0
(1/2)*x-18 = 0
1/2*x-18 = 0 // + 18
1/2*x = 18 // : 1/2
x = 18/1/2
x = 36
x = 36
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