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(z+6)+(3z-45)=z+40
We move all terms to the left:
(z+6)+(3z-45)-(z+40)=0
We get rid of parentheses
z+3z-z+6-45-40=0
We add all the numbers together, and all the variables
3z-79=0
We move all terms containing z to the left, all other terms to the right
3z=79
z=79/3
z=26+1/3
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