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(5/6)*x-((1/6)*x) = 10 // - 10
(5/6)*x-((1/6)*x)-10 = 0
(5/6)*x+(-1/6)*x-10 = 0
2/3*x-10 = 0 // + 10
2/3*x = 10 // : 2/3
x = 10/2/3
x = 15
x = 15
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