x+7x=21+15+3x

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Solution for x+7x=21+15+3x equation: 



x+7x=21+15+3x

We move all terms to the left:

x+7x-(21+15+3x)=0

We add all the numbers together, and all the variables

x+7x-(3x+36)=0

We add all the numbers together, and all the variables

8x-(3x+36)=0

We get rid of parentheses

8x-3x-36=0

We add all the numbers together, and all the variables

5x-36=0

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

5x=36

x=36/5

x=7+1/5

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