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-2z-45=-6z+-9
We move all terms to the left:
-2z-45-(-6z+-9)=0
We add all the numbers together, and all the variables
-2z-(-6z-9)-45=0
We get rid of parentheses
-2z+6z+9-45=0
We add all the numbers together, and all the variables
4z-36=0
We move all terms containing z to the left, all other terms to the right
4z=36
z=36/4
z=9
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