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(3/5)*x+3*y = 9 // - 9
(3/5)*x+3*y-9 = 0
3/5*x+3*y-9 = 0 // - 3*y-9
3/5*x = -(3*y-9) // : 3/5
x = (-(3*y-9))/3/5
x = 5/3*(9-(3*y))
x = 5/3*(9-(3*y))
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