-3(s+40)=45

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Solution for -3(s+40)=45 equation: 



-3(s+40)=45

We move all terms to the left:

-3(s+40)-(45)=0

We multiply parentheses

-3s-120-45=0

We add all the numbers together, and all the variables

-3s-165=0

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

-3s=165

s=165/-3

s=-55

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