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