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6(3+15)=6(3)+6z
We move all terms to the left:
6(3+15)-(6(3)+6z)=0
We add all the numbers together, and all the variables
-(6z+63)+618=0
We get rid of parentheses
-6z-63+618=0
We add all the numbers together, and all the variables
-6z+555=0
We move all terms containing z to the left, all other terms to the right
-6z=-555
z=-555/-6
z=92+1/2
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