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-29=2x+x+7
We move all terms to the left:
-29-(2x+x+7)=0
We add all the numbers together, and all the variables
-(3x+7)-29=0
We get rid of parentheses
-3x-7-29=0
We add all the numbers together, and all the variables
-3x-36=0
We move all terms containing x to the left, all other terms to the right
-3x=36
x=36/-3
x=-12
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