15+x=7x-21

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



15+x=7x-21

We move all terms to the left:

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

We get rid of parentheses

x-7x+21+15=0

We add all the numbers together, and all the variables

-6x+36=0

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

-6x=-36

x=-36/-6

x=+6

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