7s-4s=12

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Solution for 7s-4s=12 equation: 



7s-4s=12

We move all terms to the left:

7s-4s-(12)=0

We add all the numbers together, and all the variables

3s-12=0

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

3s=12

s=12/3

s=4

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