3x-1+x+7=90

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



3x-1+x+7=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-84=0

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

4x=84

x=84/4

x=21

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