8x+6=3x+21.

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Solution for 8x+6=3x+21. equation: 



8x+6=3x+21.

We move all terms to the left:

8x+6-(3x+21.)=0

We add all the numbers together, and all the variables

8x-(3x+21)+6=0

We get rid of parentheses

8x-3x-21+6=0

We add all the numbers together, and all the variables

5x-15=0

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

5x=15

x=15/5

x=3

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