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(2/5)*(10*x-20) = (5/6)*(12-(6*x)) // - (5/6)*(12-(6*x))
(2/5)*(10*x-20)-((5/6)*(12-(6*x))) = 0
(2/5)*(10*x-20)+(-5/6)*(12-6*x) = 0
2/5*(10*x-20)-5/6*(12-6*x) = 0
2/5*(10*x-20)-5/6*(12-6*x) = 0
9*x-18 = 0
9*x-18 = 0
9*x-18 = 0 // + 18
9*x = 18 // : 9
x = 18/9
x = 2
x = 2
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