6x+3x-4x=21

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Solution for 6x+3x-4x=21 equation: 



6x+3x-4x=21

We move all terms to the left:

6x+3x-4x-(21)=0

We add all the numbers together, and all the variables

5x-21=0

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

5x=21

x=21/5

x=4+1/5

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