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y in (-oo:+oo)
18 = -y/2 // + -y/2
18-(-y/2) = 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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