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