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-2.12+0.6b=-0.1b-8.21
We move all terms to the left:
-2.12+0.6b-(-0.1b-8.21)=0
We get rid of parentheses
0.6b+0.1b+8.21-2.12=0
We add all the numbers together, and all the variables
0.7b+6.09=0
We move all terms containing b to the left, all other terms to the right
0.7b=-6.09
b=-6.09/0.7
b=-8+0.49/0.7
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