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x in (-oo:+oo)
12/7 = -6*x // + -6*x
12/7-(-6*x) = 0
6*x+12/7 = 0
6*x+12/7 = 0 // - 12/7
6*x = -12/7 // : 6
x = -12/7/6
x = -2/7
x = -2/7
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