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6z+20=7z+12
We move all terms to the left:
6z+20-(7z+12)=0
We get rid of parentheses
6z-7z-12+20=0
We add all the numbers together, and all the variables
-1z+8=0
We move all terms containing z to the left, all other terms to the right
-z=-8
z=-8/-1
z=+8
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