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x in (-oo:+oo)
-x/3.2 = -4 // + 4
4-x/3.2 = 0
4-0.3125*x = 0 // - 4
-0.3125*x = -4 // : -0.3125
x = -4/(-0.3125)
x = 12.8
x = 12.8
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