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x in (-oo:+oo)
x/9 = -2.3 // + 2.3
x/9+2.3 = 0
1/9*x+2.3 = 0 // - 2.3
1/9*x = -2.3 // : 1/9
x = -2.3/1/9
x = -20.70000021
x = -20.70000021
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