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3z+3+4z-1+3z+3+4z-1=172
We move all terms to the left:
3z+3+4z-1+3z+3+4z-1-(172)=0
We add all the numbers together, and all the variables
14z-168=0
We move all terms containing z to the left, all other terms to the right
14z=168
z=168/14
z=12
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