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(2*x)/7+4/7 = -2/7 // + -2/7
(2*x)/7+4/7-(-2/7) = 0
(2*x)/7+4/7+2/7 = 0
2/7*x+6/7 = 0 // - 6/7
2/7*x = -6/7 // : 2/7
x = -6/7/2/7
x = -3
x = -3
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