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x in (-oo:+oo)
x/45 = 8/18 // - 8/18
x/45-(8/18) = 0
x/45-4/9 = 0
1/45*x-4/9 = 0 // + 4/9
1/45*x = 4/9 // : 1/45
x = 4/9/1/45
x = 20
x = 20
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