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x in (-oo:+oo)
x/8 = 5/4 // - 5/4
x/8-(5/4) = 0
x/8-5/4 = 0
1/8*x-5/4 = 0 // + 5/4
1/8*x = 5/4 // : 1/8
x = 5/4/1/8
x = 10
x = 10
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