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x in (-oo:+oo)
146 = (1/2)*x+(1/2)*x+9+9+9 // - (1/2)*x+(1/2)*x+9+9+9
146-((1/2)*x)-((1/2)*x)-9-9-9 = 0
(-1/2)*x+(-1/2)*x-9-9-9+146 = 0
119-x = 0 // - 119
-x = -119 // * -1
x = 119
x = 119
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