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x in (-oo:+oo)
x/4-1 = x/9+4 // - x/9+4
x/4-(x/9)-4-1 = 0
5/36*x-5 = 0 // + 5
5/36*x = 5 // : 5/36
x = 5/5/36
x = 36
x = 36
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