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y in (-oo:+oo)
(1/2)*y+1 = 5*y-7 // - 5*y-7
(1/2)*y-(5*y)+1+7 = 0
(1/2)*y-5*y+1+7 = 0
8-9/2*y = 0 // - 8
-9/2*y = -8 // : -9/2
y = -8/(-9/2)
y = 16/9
y = 16/9
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