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(3*y)/5 = 1.5*x // - 1.5*x
(3*y)/5-(1.5*x) = 0
(3*y)/5-1.5*x = 0
3/5*y-1.5*x = 0 // - 3/5*y
-1.5*x = -(3/5*y) // : -1.5
x = (-(3/5*y))/(-1.5)
x = 0.4*y
x = 0.4*y
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