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-7+19b=-20+20b
We move all terms to the left:
-7+19b-(-20+20b)=0
We add all the numbers together, and all the variables
19b-(20b-20)-7=0
We get rid of parentheses
19b-20b+20-7=0
We add all the numbers together, and all the variables
-1b+13=0
We move all terms containing b to the left, all other terms to the right
-b=-13
b=-13/-1
b=+13
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