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x in (-oo:+oo)
(1/7)*x = -2/7 // + -2/7
(1/7)*x-(-2/7) = 0
(1/7)*x+2/7 = 0
1/7*x+2/7 = 0 // - 2/7
1/7*x = -2/7 // : 1/7
x = -2/7/1/7
x = -2
x = -2
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