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3*x-((1/9)*y) = 18 // - 18
3*x-((1/9)*y)-18 = 0
3*x+(-1/9)*y-18 = 0
3*x-1/9*y-18 = 0 // + -1/9*y-18
3*x = -(-1/9*y-18) // : 3
x = (-(-1/9*y-18))/3
x = (18-(-1/9*y))/3
x = (18-(-1/9*y))/3
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