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x in (-oo:+oo)
x/9 = 5/4 // - 5/4
x/9-(5/4) = 0
x/9-5/4 = 0
1/9*x-5/4 = 0 // + 5/4
1/9*x = 5/4 // : 1/9
x = 5/4/1/9
x = 45/4
x = 45/4
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