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(3/7)*x+5/7 = -4/7 // + -4/7
(3/7)*x+5/7-(-4/7) = 0
(3/7)*x+5/7+4/7 = 0
3/7*x+9/7 = 0 // - 9/7
3/7*x = -9/7 // : 3/7
x = -9/7/3/7
x = -3
x = -3
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