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9*x-((3*y)/2) = 18 // - 18
9*x-((3*y)/2)-18 = 0
9*x+(-3/2)*y-18 = 0
9*x-3/2*y-18 = 0 // + -3/2*y-18
9*x = -(-3/2*y-18) // : 9
x = (-(-3/2*y-18))/9
x = (18-(-3/2*y))/9
x = (18-(-3/2*y))/9
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