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7(z+3)-3z=13
We move all terms to the left:
7(z+3)-3z-(13)=0
We add all the numbers together, and all the variables
-3z+7(z+3)-13=0
We multiply parentheses
-3z+7z+21-13=0
We add all the numbers together, and all the variables
4z+8=0
We move all terms containing z to the left, all other terms to the right
4z=-8
z=-8/4
z=-2
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