x+1+7x-15=90

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Solution for x+1+7x-15=90 equation: 



x+1+7x-15=90

We move all terms to the left:

x+1+7x-15-(90)=0

We add all the numbers together, and all the variables

8x-104=0

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

8x=104

x=104/8

x=13

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