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(2/3)*(x+7) = 10 // - 10
(2/3)*(x+7)-10 = 0
2/3*(x+7)-10 = 0
2/3*(x+7)-10 = 0
2/3*x-16/3 = 0
2/3*x-16/3 = 0
2/3*x-16/3 = 0 // + 16/3
2/3*x = 16/3 // : 2/3
x = 16/3/2/3
x = 8
x = 8
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