x+6x=21+15+5x

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Solution for x+6x=21+15+5x equation: 



x+6x=21+15+5x

We move all terms to the left:

x+6x-(21+15+5x)=0

We add all the numbers together, and all the variables

x+6x-(5x+36)=0

We add all the numbers together, and all the variables

7x-(5x+36)=0

We get rid of parentheses

7x-5x-36=0

We add all the numbers together, and all the variables

2x-36=0

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

2x=36

x=36/2

x=18

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