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x in (-oo:+oo)
x/8 = 9/20 // - 9/20
x/8-(9/20) = 0
x/8-9/20 = 0
1/8*x-9/20 = 0 // + 9/20
1/8*x = 9/20 // : 1/8
x = 9/20/1/8
x = 18/5
x = 18/5
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