3s-3=3(7-s)

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Solution for 3s-3=3(7-s) equation: 



3s-3=3(7-s)

We move all terms to the left:

3s-3-(3(7-s))=0

We add all the numbers together, and all the variables

3s-(3(-1s+7))-3=0



We calculate terms in parentheses: -(3(-1s+7)), so:

3(-1s+7)

We multiply parentheses

-3s+21

Back to the equation:

-(-3s+21)



We get rid of parentheses

3s+3s-21-3=0

We add all the numbers together, and all the variables

6s-24=0

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

6s=24

s=24/6

s=4

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