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(11z+2)+(6z+4)+(z+5)=90
We move all terms to the left:
(11z+2)+(6z+4)+(z+5)-(90)=0
We get rid of parentheses
11z+6z+z+2+4+5-90=0
We add all the numbers together, and all the variables
18z-79=0
We move all terms containing z to the left, all other terms to the right
18z=79
z=79/18
z=4+7/18
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