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21+19z-7z=16+31z
We move all terms to the left:
21+19z-7z-(16+31z)=0
We add all the numbers together, and all the variables
19z-7z-(31z+16)+21=0
We add all the numbers together, and all the variables
12z-(31z+16)+21=0
We get rid of parentheses
12z-31z-16+21=0
We add all the numbers together, and all the variables
-19z+5=0
We move all terms containing z to the left, all other terms to the right
-19z=-5
z=-5/-19
z=5/19
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