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7=5x+7+7x
We move all terms to the left:
7-(5x+7+7x)=0
We add all the numbers together, and all the variables
-(12x+7)+7=0
We get rid of parentheses
-12x-7+7=0
We add all the numbers together, and all the variables
-12x=0
x=0/-12
x=0
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