42=2s+12

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Solution for 42=2s+12 equation: 



42=2s+12

We move all terms to the left:

42-(2s+12)=0

We get rid of parentheses

-2s-12+42=0

We add all the numbers together, and all the variables

-2s+30=0

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

-2s=-30

s=-30/-2

s=+15

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