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(3*x)/4-((2*y)/5) = 0
(3*x)/4+(-2/5)*y = 0
3/4*x-2/5*y = 0 // + -2/5*y
3/4*x = -(-2/5*y) // : 3/4
x = (-(-2/5*y))/3/4
x = 8/15*y
x = 8/15*y
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