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50=4z+6z
We move all terms to the left:
50-(4z+6z)=0
We add all the numbers together, and all the variables
-(+10z)+50=0
We get rid of parentheses
-10z+50=0
We move all terms containing z to the left, all other terms to the right
-10z=-50
z=-50/-10
z=+5
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