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(1/3)*(2*x+7) = 7 // - 7
(1/3)*(2*x+7)-7 = 0
1/3*(2*x+7)-7 = 0
1/3*(2*x+7)-7 = 0
2/3*x-14/3 = 0
2/3*x-14/3 = 0
2/3*x-14/3 = 0 // + 14/3
2/3*x = 14/3 // : 2/3
x = 14/3/2/3
x = 7
x = 7
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