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3-4z=-21+8z
We move all terms to the left:
3-4z-(-21+8z)=0
We add all the numbers together, and all the variables
-4z-(8z-21)+3=0
We get rid of parentheses
-4z-8z+21+3=0
We add all the numbers together, and all the variables
-12z+24=0
We move all terms containing z to the left, all other terms to the right
-12z=-24
z=-24/-12
z=+2
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