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y in (-oo:+oo)
(-15/2)*y+1+5 = y // - y
(-15/2)*y-y+1+5 = 0
6-17/2*y = 0 // - 6
-17/2*y = -6 // : -17/2
y = -6/(-17/2)
y = 12/17
y = 12/17
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