3x+1+7x-1=90

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Solution for 3x+1+7x-1=90 equation: 



3x+1+7x-1=90

We move all terms to the left:

3x+1+7x-1-(90)=0

We add all the numbers together, and all the variables

10x-90=0

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

10x=90

x=90/10

x=9

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