X+2x+3x=840

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Solution for X+2x+3x=840 equation: 



X+2X+3X=840

We move all terms to the left:

X+2X+3X-(840)=0

We add all the numbers together, and all the variables

6X-840=0

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

6X=840

X=840/6

X=140

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