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(1/3)*x-((1/9)*x) = 12 // - 12
(1/3)*x-((1/9)*x)-12 = 0
(1/3)*x+(-1/9)*x-12 = 0
2/9*x-12 = 0 // + 12
2/9*x = 12 // : 2/9
x = 12/2/9
x = 54
x = 54
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