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x in (-oo:+oo)
7*x = -14/9 // + -14/9
7*x-(-14/9) = 0
7*x+14/9 = 0
7*x+14/9 = 0 // - 14/9
7*x = -14/9 // : 7
x = -14/9/7
x = -2/9
x = -2/9
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