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2(3z+4)=38
We move all terms to the left:
2(3z+4)-(38)=0
We multiply parentheses
6z+8-38=0
We add all the numbers together, and all the variables
6z-30=0
We move all terms containing z to the left, all other terms to the right
6z=30
z=30/6
z=5
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