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(3/7)*x+5/6 = -1/42 // + -1/42
(3/7)*x+5/6-(-1/42) = 0
(3/7)*x+5/6+1/42 = 0
3/7*x+6/7 = 0 // - 6/7
3/7*x = -6/7 // : 3/7
x = -6/7/3/7
x = -2
x = -2
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