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