s+2s-4=81

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Solution for s+2s-4=81 equation: 



s+2s-4=81

We move all terms to the left:

s+2s-4-(81)=0

We add all the numbers together, and all the variables

3s-85=0

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

3s=85

s=85/3

s=28+1/3

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