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3s+s+(s+75)=180
We move all terms to the left:
3s+s+(s+75)-(180)=0
We add all the numbers together, and all the variables
4s+(s+75)-180=0
We get rid of parentheses
4s+s+75-180=0
We add all the numbers together, and all the variables
5s-105=0
We move all terms containing s to the left, all other terms to the right
5s=105
s=105/5
s=21
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