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x in (-oo:+oo)
x/8 = 0.625 // - 0.625
x/8-0.625 = 0
1/8*x-0.625 = 0 // + 0.625
1/8*x = 0.625 // : 1/8
x = 0.625/1/8
x = 5
x = 5
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