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-0.4b=-6.4b+6.6
We move all terms to the left:
-0.4b-(-6.4b+6.6)=0
We get rid of parentheses
-0.4b+6.4b-6.6=0
We add all the numbers together, and all the variables
6b-6.6=0
We move all terms containing b to the left, all other terms to the right
6b=6.6
b=6.6/6
b=1+0.6/6
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