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x in (-oo:+oo)
(1/4)*(x-12)-((1/9)*(x-9)) = x-5 // - x-5
(1/4)*(x-12)-((1/9)*(x-9))-x+5 = 0
(1/4)*(x-12)+(-1/9)*(x-9)-x+5 = 0
1/4*(x-12)-1/9*(x-9)-x+5 = 0
1/4*(x-12)-1/9*(x-9)-x+5 = 0
5/36*x-x-2+5 = 0
5-31/36*x-2 = 0
3-31/36*x = 0
3-31/36*x = 0
3-31/36*x = 0 // - 3
-31/36*x = -3 // : -31/36
x = -3/(-31/36)
x = 108/31
x = 108/31
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