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x in (-oo:+oo)
x/8 = 5/2 // - 5/2
x/8-(5/2) = 0
x/8-5/2 = 0
1/8*x-5/2 = 0 // + 5/2
1/8*x = 5/2 // : 1/8
x = 5/2/1/8
x = 20
x = 20
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