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x in (-oo:+oo)
x/8 = 9/10 // - 9/10
x/8-(9/10) = 0
x/8-9/10 = 0
1/8*x-9/10 = 0 // + 9/10
1/8*x = 9/10 // : 1/8
x = 9/10/1/8
x = 36/5
x = 36/5
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