X+8+2x+x=90

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



X+8+2X+X=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

4X-82=0

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

4X=82

X=82/4

X=20+1/2

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