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z+1-3(z=10)
We move all terms to the left:
z+1-3(z-(10))=0
We multiply parentheses
z-3z+30+1=0
We add all the numbers together, and all the variables
-2z+31=0
We move all terms containing z to the left, all other terms to the right
-2z=-31
z=-31/-2
z=15+1/2
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