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-20z-13=15-7z-11z
We move all terms to the left:
-20z-13-(15-7z-11z)=0
We add all the numbers together, and all the variables
-20z-(-18z+15)-13=0
We get rid of parentheses
-20z+18z-15-13=0
We add all the numbers together, and all the variables
-2z-28=0
We move all terms containing z to the left, all other terms to the right
-2z=28
z=28/-2
z=-14
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