9x=100+80

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Solution for 9x=100+80 equation: 



9x=100+80

We move all terms to the left:

9x-(100+80)=0

We add all the numbers together, and all the variables

9x-180=0

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

9x=180

x=180/9

x=20

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