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3-10b=-4-9b
We move all terms to the left:
3-10b-(-4-9b)=0
We add all the numbers together, and all the variables
-10b-(-9b-4)+3=0
We get rid of parentheses
-10b+9b+4+3=0
We add all the numbers together, and all the variables
-1b+7=0
We move all terms containing b to the left, all other terms to the right
-b=-7
b=-7/-1
b=+7
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