2x+4x+x=840

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Solution for 2x+4x+x=840 equation: 



2x+4x+x=840

We move all terms to the left:

2x+4x+x-(840)=0

We add all the numbers together, and all the variables

7x-840=0

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

7x=840

x=840/7

x=120

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