21=12-3x=

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Solution for 21=12-3x= equation: 



21=12-3x=

We move all terms to the left:

21-(12-3x)=0

We add all the numbers together, and all the variables

-(-3x+12)+21=0

We get rid of parentheses

3x-12+21=0

We add all the numbers together, and all the variables

3x+9=0

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

3x=-9

x=-9/3

x=-3

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