4x+3=12x-21

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Solution for 4x+3=12x-21 equation: 



4x+3=12x-21

We move all terms to the left:

4x+3-(12x-21)=0

We get rid of parentheses

4x-12x+21+3=0

We add all the numbers together, and all the variables

-8x+24=0

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

-8x=-24

x=-24/-8

x=+3

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