3x-9=x+7=90

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Solution for 3x-9=x+7=90 equation: 



3x-9=x+7=90

We move all terms to the left:

3x-9-(x+7)=0

We get rid of parentheses

3x-x-7-9=0

We add all the numbers together, and all the variables

2x-16=0

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

2x=16

x=16/2

x=8

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