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-3z+12-20z=-2z-9
We move all terms to the left:
-3z+12-20z-(-2z-9)=0
We add all the numbers together, and all the variables
-23z-(-2z-9)+12=0
We get rid of parentheses
-23z+2z+9+12=0
We add all the numbers together, and all the variables
-21z+21=0
We move all terms containing z to the left, all other terms to the right
-21z=-21
z=-21/-21
z=1
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