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25=7+3b
We move all terms to the left:
25-(7+3b)=0
We add all the numbers together, and all the variables
-(3b+7)+25=0
We get rid of parentheses
-3b-7+25=0
We add all the numbers together, and all the variables
-3b+18=0
We move all terms containing b to the left, all other terms to the right
-3b=-18
b=-18/-3
b=+6
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