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7-z/12=-2
We move all terms to the left:
7-z/12-(-2)=0
We add all the numbers together, and all the variables
-z/12+9=0
We multiply all the terms by the denominator
-z+9*12=0
We add all the numbers together, and all the variables
-1z+108=0
We move all terms containing z to the left, all other terms to the right
-z=-108
z=-108/-1
z=+108
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