6-3x=3x+21

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



6-3x=3x+21

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

-6x-15=0

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

-6x=15

x=15/-6

x=-2+1/2

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