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X+12+X+12-18-X+19=X+31
We move all terms to the left:
X+12+X+12-18-X+19-(X+31)=0
We add all the numbers together, and all the variables
X-(X+31)+25=0
We get rid of parentheses
X-X-31+25=0
We add all the numbers together, and all the variables
-6!=0
There is no solution for this equation
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