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x in (-oo:+oo)
(1/2)*x-(3/7) = -31/7 // + -31/7
(1/2)*x-(3/7)-(-31/7) = 0
(1/2)*x-3/7+31/7 = 0
1/2*x+4 = 0 // - 4
1/2*x = -4 // : 1/2
x = -4/1/2
x = -8
x = -8
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