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-4=-z+12/4
We move all terms to the left:
-4-(-z+12/4)=0
We add all the numbers together, and all the variables
-(-1z+3)-4=0
We get rid of parentheses
1z-3-4=0
We add all the numbers together, and all the variables
z-7=0
We move all terms containing z to the left, all other terms to the right
z=7
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