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y in (-oo:+oo)
5*y = 15/4 // - 15/4
5*y-(15/4) = 0
5*y-15/4 = 0
5*y-15/4 = 0 // + 15/4
5*y = 15/4 // : 5
y = 15/4/5
y = 3/4
y = 3/4
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