7*(3s+10)=280

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Solution for 7*(3s+10)=280 equation: 



7(3s+10)=280

We move all terms to the left:

7(3s+10)-(280)=0

We multiply parentheses

21s+70-280=0

We add all the numbers together, and all the variables

21s-210=0

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

21s=210

s=210/21

s=10

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