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y in (-oo:+oo)
2*y+7/2 = 7*y-(1/2) // - 7*y-(1/2)
2*y-(7*y)+7/2+1/2 = 0
2*y-7*y+7/2+1/2 = 0
4-5*y = 0 // - 4
-5*y = -4 // : -5
y = -4/(-5)
y = 4/5
y = 4/5
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