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(3*x)/7+4/7 = -8/7 // + -8/7
(3*x)/7+4/7-(-8/7) = 0
(3*x)/7+4/7+8/7 = 0
3/7*x+12/7 = 0 // - 12/7
3/7*x = -12/7 // : 3/7
x = -12/7/3/7
x = -4
x = -4
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