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x in (-oo:+oo)
(2/7)*x+1/7 = -(3/7) // + 3/7
(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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