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-16z/21=-4
We move all terms to the left:
-16z/21-(-4)=0
We add all the numbers together, and all the variables
-16z/21+4=0
We multiply all the terms by the denominator
-16z+4*21=0
We add all the numbers together, and all the variables
-16z+84=0
We move all terms containing z to the left, all other terms to the right
-16z=-84
z=-84/-16
z=5+1/4
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