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x in (-oo:+oo)
5*x = (6*y)/8 // - (6*y)/8
5*x-((6*y)/8) = 0
5*x+(-3/4)*y = 0
5*x-3/4*y = 0 // + -3/4*y
5*x = -(-3/4*y) // : 5
x = (-(-3/4*y))/5
x = 3/20*y
x = 3/20*y
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