21=5b-4

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Solution for 21=5b-4 equation:



21=5b-4
We move all terms to the left:
21-(5b-4)=0
We get rid of parentheses
-5b+4+21=0
We add all the numbers together, and all the variables
-5b+25=0
We move all terms containing b to the left, all other terms to the right
-5b=-25
b=-25/-5
b=+5

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