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-3.7b+1.2=-7.8-5.5b
We move all terms to the left:
-3.7b+1.2-(-7.8-5.5b)=0
We add all the numbers together, and all the variables
-3.7b-(-5.5b-7.8)+1.2=0
We get rid of parentheses
-3.7b+5.5b+7.8+1.2=0
We add all the numbers together, and all the variables
1.8b+9=0
We move all terms containing b to the left, all other terms to the right
1.8b=-9
b=-9/1.8
b=-5
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