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5=7-4b
We move all terms to the left:
5-(7-4b)=0
We add all the numbers together, and all the variables
-(-4b+7)+5=0
We get rid of parentheses
4b-7+5=0
We add all the numbers together, and all the variables
4b-2=0
We move all terms containing b to the left, all other terms to the right
4b=2
b=2/4
b=1/2
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