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(3/7)*x+5 = -8/7 // + -8/7
(3/7)*x-(-8/7)+5 = 0
(3/7)*x+8/7+5 = 0
3/7*x+43/7 = 0 // - 43/7
3/7*x = -43/7 // : 3/7
x = -43/7/3/7
x = -43/3
x = -43/3
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