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x in (-oo:+oo)
x/4+x/9 = 5/4 // - 5/4
x/4+x/9-(5/4) = 0
x/4+x/9-5/4 = 0
13/36*x-5/4 = 0 // + 5/4
13/36*x = 5/4 // : 13/36
x = 5/4/13/36
x = 45/13
x = 45/13
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