9x+3+x+7=90

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Solution for 9x+3+x+7=90 equation: 



9x+3+x+7=90

We move all terms to the left:

9x+3+x+7-(90)=0

We add all the numbers together, and all the variables

10x-80=0

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

10x=80

x=80/10

x=8

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