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(3/8)*y-((1/4)*x) = 0
(-1/4)*x+(3/8)*y = 0
3/8*y-1/4*x = 0 // - 3/8*y
-1/4*x = -(3/8*y) // : -1/4
x = (-(3/8*y))/(-1/4)
x = 3/2*y
x = 3/2*y
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