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78.5=b+4.7
We move all terms to the left:
78.5-(b+4.7)=0
We get rid of parentheses
-b-4.7+78.5=0
We add all the numbers together, and all the variables
-1b+73.8=0
We move all terms containing b to the left, all other terms to the right
-b=-73.8
b=-73.8/-1
b=73+0.8/1
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