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15b-20b+9-6=5b+4+69
We move all terms to the left:
15b-20b+9-6-(5b+4+69)=0
We add all the numbers together, and all the variables
15b-20b-(5b+73)+9-6=0
We add all the numbers together, and all the variables
-5b-(5b+73)+3=0
We get rid of parentheses
-5b-5b-73+3=0
We add all the numbers together, and all the variables
-10b-70=0
We move all terms containing b to the left, all other terms to the right
-10b=70
b=70/-10
b=-7
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