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7+0.3b=2b=22
We move all terms to the left:
7+0.3b-(2b)=0
We add all the numbers together, and all the variables
-1.7b+7=0
We move all terms containing b to the left, all other terms to the right
-1.7b=-7
b=-7/-1.7
b=4+0.2/1.7
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