1x+2x+3x=840

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Solution for 1x+2x+3x=840 equation: 



1x+2x+3x=840

We move all terms to the left:

1x+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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