21x+11=80

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Solution for 21x+11=80 equation: 



21x+11=80

We move all terms to the left:

21x+11-(80)=0

We add all the numbers together, and all the variables

21x-69=0

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

21x=69

x=69/21

x=3+2/7

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