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(x+29)-2x=8
We move all terms to the left:
(x+29)-2x-(8)=0
We add all the numbers together, and all the variables
-2x+(x+29)-8=0
We get rid of parentheses
-2x+x+29-8=0
We add all the numbers together, and all the variables
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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