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x in (-oo:+oo)
x/1.2 = -3.6 // + 3.6
x/1.2+3.6 = 0
0.83333333*x+3.6 = 0 // - 3.6
0.83333333*x = -3.6 // : 0.83333333
x = -3.6/0.83333333
x = -4.32000002
x = -4.32000002
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