8x+12=21+5x

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Solution for 8x+12=21+5x equation: 



8x+12=21+5x

We move all terms to the left:

8x+12-(21+5x)=0

We add all the numbers together, and all the variables

8x-(5x+21)+12=0

We get rid of parentheses

8x-5x-21+12=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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