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x in (-oo:+oo)
(6/2)*x = -6/14 // + -6/14
(6/2)*x-(-6/14) = 0
(6/2)*x+3/7 = 0
3*x+3/7 = 0 // - 3/7
3*x = -3/7 // : 3
x = -3/7/3
x = -1/7
x = -1/7
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