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-18-18-13z=-9z+20
We move all terms to the left:
-18-18-13z-(-9z+20)=0
We add all the numbers together, and all the variables
-13z-(-9z+20)-36=0
We get rid of parentheses
-13z+9z-20-36=0
We add all the numbers together, and all the variables
-4z-56=0
We move all terms containing z to the left, all other terms to the right
-4z=56
z=56/-4
z=-14
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