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x in (-oo:+oo)
x/3.5 = -1.2 // + 1.2
x/3.5+1.2 = 0
0.28571429*x+1.2 = 0 // - 1.2
0.28571429*x = -1.2 // : 0.28571429
x = -1.2/0.28571429
x = -4.19999994
x = -4.19999994
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