69=6x+21

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Solution for 69=6x+21 equation: 



69=6x+21

We move all terms to the left:

69-(6x+21)=0

We get rid of parentheses

-6x-21+69=0

We add all the numbers together, and all the variables

-6x+48=0

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

-6x=-48

x=-48/-6

x=+8

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