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(1/4)*x-((1/9)*x) = 10 // - 10
(1/4)*x-((1/9)*x)-10 = 0
(1/4)*x+(-1/9)*x-10 = 0
5/36*x-10 = 0 // + 10
5/36*x = 10 // : 5/36
x = 10/5/36
x = 72
x = 72
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