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