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550=315+45s
We move all terms to the left:
550-(315+45s)=0
We add all the numbers together, and all the variables
-(45s+315)+550=0
We get rid of parentheses
-45s-315+550=0
We add all the numbers together, and all the variables
-45s+235=0
We move all terms containing s to the left, all other terms to the right
-45s=-235
s=-235/-45
s=5+2/9
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