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x in (-oo:+oo)
(8/2.4)*x = -100 // + 100
(8/2.4)*x+100 = 0
3.33333333*x+100 = 0 // - 100
3.33333333*x = -100 // : 3.33333333
x = -100/3.33333333
x = -30.00000003
x = -30.00000003
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