2.5x-9=81-2.5x

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Solution for 2.5x-9=81-2.5x equation: 



2.5x-9=81-2.5x

We move all terms to the left:

2.5x-9-(81-2.5x)=0

We add all the numbers together, and all the variables

2.5x-(-2.5x+81)-9=0

We get rid of parentheses

2.5x+2.5x-81-9=0

We add all the numbers together, and all the variables

5x-90=0

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

5x=90

x=90/5

x=18

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