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7500=250+b
We move all terms to the left:
7500-(250+b)=0
We add all the numbers together, and all the variables
-(b+250)+7500=0
We get rid of parentheses
-b-250+7500=0
We add all the numbers together, and all the variables
-1b+7250=0
We move all terms containing b to the left, all other terms to the right
-b=-7250
b=-7250/-1
b=+7250
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