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4z+29=z+21
We move all terms to the left:
4z+29-(z+21)=0
We get rid of parentheses
4z-z-21+29=0
We add all the numbers together, and all the variables
3z+8=0
We move all terms containing z to the left, all other terms to the right
3z=-8
z=-8/3
z=-2+2/3
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