x+2x+4x+8x=90

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Solution for x+2x+4x+8x=90 equation: 



x+2x+4x+8x=90

We move all terms to the left:

x+2x+4x+8x-(90)=0

We add all the numbers together, and all the variables

15x-90=0

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

15x=90

x=90/15

x=6

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