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8+4z=-8+8z-4
We move all terms to the left:
8+4z-(-8+8z-4)=0
We add all the numbers together, and all the variables
4z-(8z-12)+8=0
We get rid of parentheses
4z-8z+12+8=0
We add all the numbers together, and all the variables
-4z+20=0
We move all terms containing z to the left, all other terms to the right
-4z=-20
z=-20/-4
z=+5
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