x+3=4x-21

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Solution for x+3=4x-21 equation: 



x+3=4x-21

We move all terms to the left:

x+3-(4x-21)=0

We get rid of parentheses

x-4x+21+3=0

We add all the numbers together, and all the variables

-3x+24=0

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

-3x=-24

x=-24/-3

x=+8

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