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(x+7)/14 = 6-((3/7)*x) // - 6-((3/7)*x)
(x+7)/14+(3/7)*x-6 = 0
(x+7)/14+(3*x)/7-6 = 0
(7*(x+7))/(7*14)+(3*14*x)/(7*14)+(-6*7*14)/(7*14) = 0
7*(x+7)+3*14*x-6*7*14 = 0
49*x-588+49 = 0
49*x-539 = 0
(49*x-539)/(7*14) = 0
(49*x-539)/(7*14) = 0 // * 7*14
49*x-539 = 0
49*x-539 = 0 // + 539
49*x = 539 // : 49
x = 539/49
x = 11
x = 11
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