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1.4=-2.5-3.9b
We move all terms to the left:
1.4-(-2.5-3.9b)=0
We add all the numbers together, and all the variables
-(-3.9b-2.5)+1.4=0
We get rid of parentheses
3.9b+2.5+1.4=0
We add all the numbers together, and all the variables
3.9b+3.9=0
We move all terms containing b to the left, all other terms to the right
3.9b=-3.9
b=-3.9/3.9
b=-1
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