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x in (-oo:+oo)
(-1/4)*(x-8)+x+2 = x+9 // - x+9
(-1/4)*(x-8)+x-x-9+2 = 0
x-1/4*(x-8)-x-9+2 = 0
x-1/4*(x-8)-x-9+2 = 0
3/4*x-x-9+2+2 = 0
2-1/4*x-9+2 = 0
2-1/4*x-7 = 0
-1/4*x-5 = 0
-1/4*x-5 = 0
-1/4*x-5 = 0 // + 5
-1/4*x = 5 // : -1/4
x = 5/(-1/4)
x = -20
x = -20
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