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144=12+z
We move all terms to the left:
144-(12+z)=0
We add all the numbers together, and all the variables
-(z+12)+144=0
We get rid of parentheses
-z-12+144=0
We add all the numbers together, and all the variables
-1z+132=0
We move all terms containing z to the left, all other terms to the right
-z=-132
z=-132/-1
z=+132
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