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(2/5)*x = (3*y)/8 // - (3*y)/8
(2/5)*x-((3*y)/8) = 0
(2/5)*x+(-3/8)*y = 0
2/5*x-3/8*y = 0 // + -3/8*y
2/5*x = -(-3/8*y) // : 2/5
x = (-(-3/8*y))/2/5
x = 15/16*y
x = 15/16*y
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