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0.04b+13=0.4b=-8.6
We move all terms to the left:
0.04b+13-(0.4b)=0
We add all the numbers together, and all the variables
0.04b-(+0.4b)+13=0
We get rid of parentheses
0.04b-0.4b+13=0
We add all the numbers together, and all the variables
-0.36b+13=0
We move all terms containing b to the left, all other terms to the right
-0.36b=-13
b=-13/-0.36
b=36+0.040000000000001/0.36
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