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48=4b-4
We move all terms to the left:
48-(4b-4)=0
We get rid of parentheses
-4b+4+48=0
We add all the numbers together, and all the variables
-4b+52=0
We move all terms containing b to the left, all other terms to the right
-4b=-52
b=-52/-4
b=+13
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