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(4/7)*x+6/7 = -2/7 // + -2/7
(4/7)*x+6/7-(-2/7) = 0
(4/7)*x+6/7+2/7 = 0
4/7*x+8/7 = 0 // - 8/7
4/7*x = -8/7 // : 4/7
x = -8/7/4/7
x = -2
x = -2
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