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x+19=x+17+20
We move all terms to the left:
x+19-(x+17+20)=0
We add all the numbers together, and all the variables
x-(x+37)+19=0
We get rid of parentheses
x-x-37+19=0
We add all the numbers together, and all the variables
-18!=0
There is no solution for this equation
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