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7*(2*x+6) = 168 // - 168
7*(2*x+6)-168 = 0
7*(2*x+6)-168 = 0
14*x-126 = 0
14*x-126 = 0
14*x-126 = 0 // + 126
14*x = 126 // : 14
x = 126/14
x = 9
x = 9
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