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y in (-oo:+oo)
3*y = 15/8 // - 15/8
3*y-(15/8) = 0
3*y-15/8 = 0
3*y-15/8 = 0 // + 15/8
3*y = 15/8 // : 3
y = 15/8/3
y = 5/8
y = 5/8
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