10s+21=81

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Solution for 10s+21=81 equation: 



10s+21=81

We move all terms to the left:

10s+21-(81)=0

We add all the numbers together, and all the variables

10s-60=0

We move all terms containing s to the left, all other terms to the right

10s=60

s=60/10

s=6

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