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x in (-oo:+oo)
x/3.5 = -5 // + 5
x/3.5+5 = 0
0.28571429*x+5 = 0 // - 5
0.28571429*x = -5 // : 0.28571429
x = -5/0.28571429
x = -17.49999974
x = -17.49999974
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