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(z-13)+(z-10)+z=360
We move all terms to the left:
(z-13)+(z-10)+z-(360)=0
We add all the numbers together, and all the variables
z+(z-13)+(z-10)-360=0
We get rid of parentheses
z+z+z-13-10-360=0
We add all the numbers together, and all the variables
3z-383=0
We move all terms containing z to the left, all other terms to the right
3z=383
z=383/3
z=127+2/3
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