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20=10+5z
We move all terms to the left:
20-(10+5z)=0
We add all the numbers together, and all the variables
-(5z+10)+20=0
We get rid of parentheses
-5z-10+20=0
We add all the numbers together, and all the variables
-5z+10=0
We move all terms containing z to the left, all other terms to the right
-5z=-10
z=-10/-5
z=+2
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