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8s+21=11s-50
We move all terms to the left:
8s+21-(11s-50)=0
We get rid of parentheses
8s-11s+50+21=0
We add all the numbers together, and all the variables
-3s+71=0
We move all terms containing s to the left, all other terms to the right
-3s=-71
s=-71/-3
s=23+2/3
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