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x in (-oo:+oo)
x/3.2 = -2.1 // + 2.1
x/3.2+2.1 = 0
0.3125*x+2.1 = 0 // - 2.1
0.3125*x = -2.1 // : 0.3125
x = -2.1/0.3125
x = -6.72
x = -6.72
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