3x+2x+6+x=4x+21

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Solution for 3x+2x+6+x=4x+21 equation: 



3x+2x+6+x=4x+21

We move all terms to the left:

3x+2x+6+x-(4x+21)=0

We add all the numbers together, and all the variables

6x-(4x+21)+6=0

We get rid of parentheses

6x-4x-21+6=0

We add all the numbers together, and all the variables

2x-15=0

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

2x=15

x=15/2

x=7+1/2

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