x+6x=21+15-3x

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



x+6x=21+15-3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x+6x-(-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

10x-36=0

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

10x=36

x=36/10

x=3+3/5

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