7x-6=8x-21

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Solution for 7x-6=8x-21 equation: 



7x-6=8x-21

We move all terms to the left:

7x-6-(8x-21)=0

We get rid of parentheses

7x-8x+21-6=0

We add all the numbers together, and all the variables

-1x+15=0

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

-x=-15

x=-15/-1

x=+15

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