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3(z+5)+3z=135
We move all terms to the left:
3(z+5)+3z-(135)=0
We add all the numbers together, and all the variables
3z+3(z+5)-135=0
We multiply parentheses
3z+3z+15-135=0
We add all the numbers together, and all the variables
6z-120=0
We move all terms containing z to the left, all other terms to the right
6z=120
z=120/6
z=20
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