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x in (-oo:+oo)
x/6 = 12.8 // - 12.8
x/6-12.8 = 0
1/6*x-12.8 = 0 // + 12.8
1/6*x = 12.8 // : 1/6
x = 12.8/1/6
x = 76.79999846
x = 76.79999846
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