21=b/3+15

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Solution for 21=b/3+15 equation:



21=b/3+15
We move all terms to the left:
21-(b/3+15)=0
We get rid of parentheses
-b/3-15+21=0
We multiply all the terms by the denominator
-b-15*3+21*3=0
We add all the numbers together, and all the variables
-1b+18=0
We move all terms containing b to the left, all other terms to the right
-b=-18
b=-18/-1
b=+18

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