4x+5x=21

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Solution for 4x+5x=21 equation: 



4x+5x=21

We move all terms to the left:

4x+5x-(21)=0

We add all the numbers together, and all the variables

9x-21=0

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

9x=21

x=21/9

x=2+1/3

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