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x in (-oo:+oo)
7*x = -14/15 // + -14/15
7*x-(-14/15) = 0
7*x+14/15 = 0
7*x+14/15 = 0 // - 14/15
7*x = -14/15 // : 7
x = -14/15/7
x = -2/15
x = -2/15
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