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x in (-oo:+oo)
(-1/6)*(x-18)-((1/8)*(x-8)) = x+5 // - x+5
(-1/6)*(x-18)-((1/8)*(x-8))-x-5 = 0
(-1/6)*(x-18)+(-1/8)*(x-8)-x-5 = 0
-1/6*(x-18)-1/8*(x-8)-x-5 = 0
-1/6*(x-18)-1/8*(x-8)-x-5 = 0
4-7/24*x-x-5 = 0
4-31/24*x-5 = 0
-31/24*x-1 = 0
-31/24*x-1 = 0
-31/24*x-1 = 0 // + 1
-31/24*x = 1 // : -31/24
x = 1/(-31/24)
x = -24/31
x = -24/31
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