45-4b=21

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Solution for 45-4b=21 equation: 



45-4b=21

We move all terms to the left:

45-4b-(21)=0

We add all the numbers together, and all the variables

-4b+24=0

We move all terms containing b to the left, all other terms to the right

-4b=-24

b=-24/-4

b=+6

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