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100+z=76+7z
We move all terms to the left:
100+z-(76+7z)=0
We add all the numbers together, and all the variables
z-(7z+76)+100=0
We get rid of parentheses
z-7z-76+100=0
We add all the numbers together, and all the variables
-6z+24=0
We move all terms containing z to the left, all other terms to the right
-6z=-24
z=-24/-6
z=+4
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