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3*x-((5/6)*x) = 39 // - 39
3*x-((5/6)*x)-39 = 0
3*x+(-5/6)*x-39 = 0
13/6*x-39 = 0 // + 39
13/6*x = 39 // : 13/6
x = 39/13/6
x = 18
x = 18
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