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x in (-oo:+oo)
x/8 = 12.8 // - 12.8
x/8-12.8 = 0
1/8*x-12.8 = 0 // + 12.8
1/8*x = 12.8 // : 1/8
x = 12.8/1/8
x = 102.4
x = 102.4
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