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6(z+3)+3z=
We move all terms to the left:
6(z+3)+3z-()=0
We add all the numbers together, and all the variables
3z+6(z+3)=0
We multiply parentheses
3z+6z+18=0
We add all the numbers together, and all the variables
9z+18=0
We move all terms containing z to the left, all other terms to the right
9z=-18
z=-18/9
z=-2
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