12=4(s-15)

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Solution for 12=4(s-15) equation: 



12=4(s-15)

We move all terms to the left:

12-(4(s-15))=0



We calculate terms in parentheses: -(4(s-15)), so:

4(s-15)

We multiply parentheses

4s-60

Back to the equation:

-(4s-60)



We get rid of parentheses

-4s+60+12=0

We add all the numbers together, and all the variables

-4s+72=0

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

-4s=-72

s=-72/-4

s=+18

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