x+8+2x-8=90

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Solution for x+8+2x-8=90 equation: 



x+8+2x-8=90

We move all terms to the left:

x+8+2x-8-(90)=0

We add all the numbers together, and all the variables

3x-90=0

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

3x=90

x=90/3

x=30

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