4x+21=8x-12

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Solution for 4x+21=8x-12 equation: 



4x+21=8x-12

We move all terms to the left:

4x+21-(8x-12)=0

We get rid of parentheses

4x-8x+12+21=0

We add all the numbers together, and all the variables

-4x+33=0

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

-4x=-33

x=-33/-4

x=8+1/4

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