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x in (-oo:+oo)
4*x = -2/7 // + -2/7
4*x-(-2/7) = 0
4*x+2/7 = 0
4*x+2/7 = 0 // - 2/7
4*x = -2/7 // : 4
x = -2/7/4
x = -1/14
x = -1/14
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