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x in (-oo:+oo)
(1/2)*(x-8) = (-2/3)*(6-(9*x)) // - (-2/3)*(6-(9*x))
(1/2)*(x-8)-((-2/3)*(6-(9*x))) = 0
(1/2)*(x-8)+(2/3)*(6-9*x) = 0
1/2*(x-8)+2/3*(6-9*x) = 0
1/2*(x-8)+2/3*(6-9*x) = 0
-11/2*x = 0
(-11*x)/2 = 0
(-11*x)/2 = 0 // * 2
-11*x = 0
-11*x = 0 // : -11
x = 0
x = 0
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