X+8+x+2x=40

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Solution for X+8+x+2x=40 equation: 



X+8+X+2X=40

We move all terms to the left:

X+8+X+2X-(40)=0

We add all the numbers together, and all the variables

4X-32=0

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

4X=32

X=32/4

X=8

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