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25=9b+7
We move all terms to the left:
25-(9b+7)=0
We get rid of parentheses
-9b-7+25=0
We add all the numbers together, and all the variables
-9b+18=0
We move all terms containing b to the left, all other terms to the right
-9b=-18
b=-18/-9
b=+2
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