3x+9=1x+21

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Solution for 3x+9=1x+21 equation: 



3x+9=1x+21

We move all terms to the left:

3x+9-(1x+21)=0

We add all the numbers together, and all the variables

3x-(x+21)+9=0

We get rid of parentheses

3x-x-21+9=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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