8.4-3x-x=21

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Solution for 8.4-3x-x=21 equation: 



8.4-3x-x=21

We move all terms to the left:

8.4-3x-x-(21)=0

We add all the numbers together, and all the variables

-4x-12.6=0

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

-4x=12.6

x=12.6/-4

x=-3+0.6/4

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