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