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X in (-oo:+oo)
4*X = -7/5 // + -7/5
4*X-(-7/5) = 0
4*X+7/5 = 0
4*X+7/5 = 0 // - 7/5
4*X = -7/5 // : 4
X = -7/5/4
X = -7/20
X = -7/20
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