3x+21=x+(1-3x)

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Solution for 3x+21=x+(1-3x) equation: 



3x+21=x+(1-3x)

We move all terms to the left:

3x+21-(x+(1-3x))=0

We add all the numbers together, and all the variables

3x-(x+(-3x+1))+21=0



We calculate terms in parentheses: -(x+(-3x+1)), so:

x+(-3x+1)

We get rid of parentheses

x-3x+1

We add all the numbers together, and all the variables

-2x+1

Back to the equation:

-(-2x+1)



We get rid of parentheses

3x+2x-1+21=0

We add all the numbers together, and all the variables

5x+20=0

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

5x=-20

x=-20/5

x=-4

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