7x+1+2x+11=90

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Solution for 7x+1+2x+11=90 equation: 



7x+1+2x+11=90

We move all terms to the left:

7x+1+2x+11-(90)=0

We add all the numbers together, and all the variables

9x-78=0

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

9x=78

x=78/9

x=8+2/3

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