3s+45=8s+30

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Solution for 3s+45=8s+30 equation: 



3s+45=8s+30

We move all terms to the left:

3s+45-(8s+30)=0

We get rid of parentheses

3s-8s-30+45=0

We add all the numbers together, and all the variables

-5s+15=0

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

-5s=-15

s=-15/-5

s=+3

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