15s-19s-7=21

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Solution for 15s-19s-7=21 equation: 



15s-19s-7=21

We move all terms to the left:

15s-19s-7-(21)=0

We add all the numbers together, and all the variables

-4s-28=0

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

-4s=28

s=28/-4

s=-7

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