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y in (-oo:+oo)
7/2+5/2 = 2*y-3 // - 2*y-3
7/2-(2*y)+5/2+3 = 0
7/2-2*y+5/2+3 = 0
9-2*y = 0 // - 9
-2*y = -9 // : -2
y = -9/(-2)
y = 9/2
y = 9/2
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