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20=11z+7
We move all terms to the left:
20-(11z+7)=0
We get rid of parentheses
-11z-7+20=0
We add all the numbers together, and all the variables
-11z+13=0
We move all terms containing z to the left, all other terms to the right
-11z=-13
z=-13/-11
z=1+2/11
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