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y in (-oo:+oo)
5*y-(25/2) = -3*y // + -3*y
5*y-(-3*y)-(25/2) = 0
5*y+3*y-25/2 = 0
8*y-25/2 = 0 // + 25/2
8*y = 25/2 // : 8
y = 25/2/8
y = 25/16
y = 25/16
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