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(2/7)*x+1/7 = -3/7 // + -3/7
(2/7)*x+1/7-(-3/7) = 0
(2/7)*x+1/7+3/7 = 0
2/7*x+4/7 = 0 // - 4/7
2/7*x = -4/7 // : 2/7
x = -4/7/2/7
x = -2
x = -2
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