3x+12+4x=21+4x

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Solution for 3x+12+4x=21+4x equation: 



3x+12+4x=21+4x

We move all terms to the left:

3x+12+4x-(21+4x)=0

We add all the numbers together, and all the variables

3x+4x-(4x+21)+12=0

We add all the numbers together, and all the variables

7x-(4x+21)+12=0

We get rid of parentheses

7x-4x-21+12=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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