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-4z+7=-11z-21
We move all terms to the left:
-4z+7-(-11z-21)=0
We get rid of parentheses
-4z+11z+21+7=0
We add all the numbers together, and all the variables
7z+28=0
We move all terms containing z to the left, all other terms to the right
7z=-28
z=-28/7
z=-4
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