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29=2x+21
We move all terms to the left:
29-(2x+21)=0
We get rid of parentheses
-2x-21+29=0
We add all the numbers together, and all the variables
-2x+8=0
We move all terms containing x to the left, all other terms to the right
-2x=-8
x=-8/-2
x=+4
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