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x+6x=21+153x

We move all terms to the left:

x+6x-(21+153x)=0

We add all the numbers together, and all the variables

x+6x-(153x+21)=0

We add all the numbers together, and all the variables

7x-(153x+21)=0

We get rid of parentheses

7x-153x-21=0

We add all the numbers together, and all the variables

-146x-21=0

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

-146x=21

x=21/-146

x=-21/146

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