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4*x-((4/7)*x) = 2/7 // - 2/7
4*x-((4/7)*x)-(2/7) = 0
4*x+(-4/7)*x-2/7 = 0
24/7*x-2/7 = 0 // + 2/7
24/7*x = 2/7 // : 24/7
x = 2/7/24/7
x = 1/12
x = 1/12
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