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9*x-(6*x)+(3/4)*y = 0
9*x-6*x+(3/4)*y = 0
3*x+3/4*y = 0 // - 3/4*y
3*x = -(3/4*y) // : 3
x = (-(3/4*y))/3
x = -1/4*y
x = -1/4*y
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