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0.35=b/4.2
We move all terms to the left:
0.35-(b/4.2)=0
We add all the numbers together, and all the variables
-(+b/4.2)+0.35=0
We get rid of parentheses
-b/4.2+0.35=0
We multiply all the terms by the denominator
-b+(0.35)*4.2=0
We add all the numbers together, and all the variables
-1b+1.47=0
We move all terms containing b to the left, all other terms to the right
-b=-1.47
b=-1.47/-1
b=1+0.47/1
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