3s-12=-21

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Solution for 3s-12=-21 equation: 



3s-12=-21

We move all terms to the left:

3s-12-(-21)=0

We add all the numbers together, and all the variables

3s+9=0

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

3s=-9

s=-9/3

s=-3

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