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7-7=19x+12x
We move all terms to the left:
7-7-(19x+12x)=0
We add all the numbers together, and all the variables
-(+31x)+7-7=0
We add all the numbers together, and all the variables
-(+31x)=0
We get rid of parentheses
-31x=0
x=0/-31
x=0
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