21+3x=6x+3

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



21+3x=6x+3

We move all terms to the left:

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

We get rid of parentheses

3x-6x-3+21=0

We add all the numbers together, and all the variables

-3x+18=0

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

-3x=-18

x=-18/-3

x=+6

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