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x in (-oo:+oo)
8*x-(1/4) = 31/4 // - 31/4
8*x-(1/4)-(31/4) = 0
8*x-1/4-31/4 = 0
8*x-8 = 0 // + 8
8*x = 8 // : 8
x = 8/8
x = 1
x = 1
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