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x in (-oo:+oo)
x/9 = -12/6 // + -12/6
x/9-(-12/6) = 0
x/9+2 = 0
1/9*x+2 = 0 // - 2
1/9*x = -2 // : 1/9
x = -2/1/9
x = -18
x = -18
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