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x in (-oo:+oo)
x/6 = -2.3 // + 2.3
x/6+2.3 = 0
1/6*x+2.3 = 0 // - 2.3
1/6*x = -2.3 // : 1/6
x = -2.3/1/6
x = -13.79999972
x = -13.79999972
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