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5(4s+9)=225
We move all terms to the left:
5(4s+9)-(225)=0
We multiply parentheses
20s+45-225=0
We add all the numbers together, and all the variables
20s-180=0
We move all terms containing s to the left, all other terms to the right
20s=180
s=180/20
s=9
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