15x=21+8x

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Solution for 15x=21+8x equation: 



15x=21+8x

We move all terms to the left:

15x-(21+8x)=0

We add all the numbers together, and all the variables

15x-(8x+21)=0

We get rid of parentheses

15x-8x-21=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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