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