X+21=4o

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Solution for X+21=4o equation: 



X+21=4X

We move all terms to the left:

X+21-(4X)=0

We add all the numbers together, and all the variables

-3X+21=0

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

-3X=-21

X=-21/-3

X=+7

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