9+7x=100

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Solution for 9+7x=100 equation: 



9+7x=100

We move all terms to the left:

9+7x-(100)=0

We add all the numbers together, and all the variables

7x-91=0

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

7x=91

x=91/7

x=13

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