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(3/7)*x-((1/7)*x) = 4 // - 4
(3/7)*x-((1/7)*x)-4 = 0
(3/7)*x+(-1/7)*x-4 = 0
2/7*x-4 = 0 // + 4
2/7*x = 4 // : 2/7
x = 4/2/7
x = 14
x = 14
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