6x+9x=21

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Solution for 6x+9x=21 equation: 



6x+9x=21

We move all terms to the left:

6x+9x-(21)=0

We add all the numbers together, and all the variables

15x-21=0

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

15x=21

x=21/15

x=1+2/5

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