4+9x=21

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Solution for 4+9x=21 equation: 



4+9x=21

We move all terms to the left:

4+9x-(21)=0

We add all the numbers together, and all the variables

9x-17=0

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

9x=17

x=17/9

x=1+8/9

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