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x in (-oo:+oo)
3*6-(6*((-9*4)/2))+6+9 = x // - x
3*6-x-(6*((-9*4)/2))+6+9 = 0
3*6-x+6+9+108 = 0
141-x = 0 // - 141
-x = -141 // * -1
x = 141
x = 141
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