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(2/3)*x = (1/5)*x+7 // - (1/5)*x+7
(2/3)*x-((1/5)*x)-7 = 0
(2/3)*x+(-1/5)*x-7 = 0
7/15*x-7 = 0 // + 7
7/15*x = 7 // : 7/15
x = 7/7/15
x = 15
x = 15
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