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x in (-oo:+oo)
x/9 = -4/9 // + -4/9
x/9-(-4/9) = 0
x/9+4/9 = 0
1/9*x+4/9 = 0 // - 4/9
1/9*x = -4/9 // : 1/9
x = -4/9/1/9
x = -4
x = -4
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