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138=80+28z+10-4z
We move all terms to the left:
138-(80+28z+10-4z)=0
We add all the numbers together, and all the variables
-(24z+90)+138=0
We get rid of parentheses
-24z-90+138=0
We add all the numbers together, and all the variables
-24z+48=0
We move all terms containing z to the left, all other terms to the right
-24z=-48
z=-48/-24
z=+2
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