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y in (-oo:+oo)
3*y+1/2 = 5*y+6/8+5 // - 5*y+6/8+5
3*y-(5*y)+1/2-(6/8)-5 = 0
3*y-5*y+1/2-3/4-5 = 0
-2*y-21/4 = 0 // + 21/4
-2*y = 21/4 // : -2
y = 21/4/(-2)
y = -21/8
y = -21/8
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