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x in (-oo:+oo)
x/8 = 9/4 // - 9/4
x/8-(9/4) = 0
x/8-9/4 = 0
1/8*x-9/4 = 0 // + 9/4
1/8*x = 9/4 // : 1/8
x = 9/4/1/8
x = 18
x = 18
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