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x in (-oo:+oo)
x/45 = 5/9 // - 5/9
x/45-(5/9) = 0
x/45-5/9 = 0
1/45*x-5/9 = 0 // + 5/9
1/45*x = 5/9 // : 1/45
x = 5/9/1/45
x = 25
x = 25
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