X+2x+2x-18=57

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Solution for X+2x+2x-18=57 equation: 



X+2X+2X-18=57

We move all terms to the left:

X+2X+2X-18-(57)=0

We add all the numbers together, and all the variables

5X-75=0

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

5X=75

X=75/5

X=15

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