15+2s=21

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Solution for 15+2s=21 equation: 



15+2s=21

We move all terms to the left:

15+2s-(21)=0

We add all the numbers together, and all the variables

2s-6=0

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

2s=6

s=6/2

s=3

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