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-5(21+4z)=-205
We move all terms to the left:
-5(21+4z)-(-205)=0
We add all the numbers together, and all the variables
-5(4z+21)-(-205)=0
We add all the numbers together, and all the variables
-5(4z+21)+205=0
We multiply parentheses
-20z-105+205=0
We add all the numbers together, and all the variables
-20z+100=0
We move all terms containing z to the left, all other terms to the right
-20z=-100
z=-100/-20
z=+5
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