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x in (-oo:+oo)
x/4+x/9 = 10 // - 10
x/4+x/9-10 = 0
13/36*x-10 = 0 // + 10
13/36*x = 10 // : 13/36
x = 10/13/36
x = 360/13
x = 360/13
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