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X in (-oo:+oo)
(1/6)*(X-5) = (2/3)*(X+4)-((1/3)*X) // - (2/3)*(X+4)-((1/3)*X)
(1/6)*(X-5)-((2/3)*(X+4))+(1/3)*X = 0
(1/6)*(X-5)+(-2/3)*(X+4)+(1/3)*X = 0
1/6*(X-5)-2/3*(X+4)+X/3 = 0
(1/6*3*(X-5))/3+(-2/3*3*(X+4))/3+X/3 = 0
1/6*3*(X-5)-2/3*3*(X+4)+X = 0
X-3/2*X-21/2 = 0
-1/2*X-21/2 = 0
(-1/2*X-21/2)/3 = 0
(-1/2*X-21/2)/3 = 0 // * 3
-1/2*X-21/2 = 0
-1/2*X-21/2 = 0 // + 21/2
-1/2*X = 21/2 // : -1/2
X = 21/2/(-1/2)
X = -21
X = -21
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