13+7x=90

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Solution for 13+7x=90 equation: 



13+7x=90

We move all terms to the left:

13+7x-(90)=0

We add all the numbers together, and all the variables

7x-77=0

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

7x=77

x=77/7

x=11

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