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4b+290-40=b-50
We move all terms to the left:
4b+290-40-(b-50)=0
We add all the numbers together, and all the variables
4b-(b-50)+250=0
We get rid of parentheses
4b-b+50+250=0
We add all the numbers together, and all the variables
3b+300=0
We move all terms containing b to the left, all other terms to the right
3b=-300
b=-300/3
b=-100
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