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40=16+4z
We move all terms to the left:
40-(16+4z)=0
We add all the numbers together, and all the variables
-(4z+16)+40=0
We get rid of parentheses
-4z-16+40=0
We add all the numbers together, and all the variables
-4z+24=0
We move all terms containing z to the left, all other terms to the right
-4z=-24
z=-24/-4
z=+6
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