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