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y in (-oo:+oo)
(5/2)*y+9/6 = 2*y-7 // - 2*y-7
(5/2)*y-(2*y)+9/6+7 = 0
(5/2)*y-2*y+9/6+7 = 0
1/2*y+17/2 = 0 // - 17/2
1/2*y = -17/2 // : 1/2
y = -17/2/1/2
y = -17
y = -17
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