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y in (-oo:+oo)
-7 = y/2+5 // - y/2+5
-(y/2)-7-5 = 0
-1/2*y-12 = 0 // + 12
-1/2*y = 12 // : -1/2
y = 12/(-1/2)
y = -24
y = -24
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