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-3b+6.2=-7.2
We move all terms to the left:
-3b+6.2-(-7.2)=0
We add all the numbers together, and all the variables
-3b+13.4=0
We move all terms containing b to the left, all other terms to the right
-3b=-13.4
b=-13.4/-3
b=4+1/2.14285714286
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