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x in (-oo:+oo)
7*x = -35/11 // + -35/11
7*x-(-35/11) = 0
7*x+35/11 = 0
7*x+35/11 = 0 // - 35/11
7*x = -35/11 // : 7
x = -35/11/7
x = -5/11
x = -5/11
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