9+3x-12+5x=21

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Solution for 9+3x-12+5x=21 equation: 



9+3x-12+5x=21

We move all terms to the left:

9+3x-12+5x-(21)=0

We add all the numbers together, and all the variables

8x-24=0

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

8x=24

x=24/8

x=3

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