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y in (-oo:+oo)
(1*y)/2 = -15 // + 15
(1*y)/2+15 = 0
y/2+15 = 0
1/2*y+15 = 0 // - 15
1/2*y = -15 // : 1/2
y = -15/1/2
y = -30
y = -30
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