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40=8+z
We move all terms to the left:
40-(8+z)=0
We add all the numbers together, and all the variables
-(z+8)+40=0
We get rid of parentheses
-z-8+40=0
We add all the numbers together, and all the variables
-1z+32=0
We move all terms containing z to the left, all other terms to the right
-z=-32
z=-32/-1
z=+32
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