15+12s=21

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Solution for 15+12s=21 equation: 



15+12s=21

We move all terms to the left:

15+12s-(21)=0

We add all the numbers together, and all the variables

12s-6=0

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

12s=6

s=6/12

s=1/2

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