6x+x=15+21+3x

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Solution for 6x+x=15+21+3x equation: 



6x+x=15+21+3x

We move all terms to the left:

6x+x-(15+21+3x)=0

We add all the numbers together, and all the variables

6x+x-(3x+36)=0

We add all the numbers together, and all the variables

7x-(3x+36)=0

We get rid of parentheses

7x-3x-36=0

We add all the numbers together, and all the variables

4x-36=0

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

4x=36

x=36/4

x=9

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