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(3/7)*x-(1/8) = -1/392 // + -1/392
(3/7)*x-(1/8)-(-1/392) = 0
(3/7)*x-1/8+1/392 = 0
3/7*x-6/49 = 0 // + 6/49
3/7*x = 6/49 // : 3/7
x = 6/49/3/7
x = 2/7
x = 2/7
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