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x in (-oo:+oo)
x/12.8 = 4 // - 4
x/12.8-4 = 0
0.078125*x-4 = 0 // + 4
0.078125*x = 4 // : 0.078125
x = 4/0.078125
x = 51.2
x = 51.2
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