7x-216=99-8x

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Solution for 7x-216=99-8x equation: 



7x-216=99-8x

We move all terms to the left:

7x-216-(99-8x)=0

We add all the numbers together, and all the variables

7x-(-8x+99)-216=0

We get rid of parentheses

7x+8x-99-216=0

We add all the numbers together, and all the variables

15x-315=0

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

15x=315

x=315/15

x=21

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