5x+2x-9=12

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Solution for 5x+2x-9=12 equation: 



5x+2x-9=12

We move all terms to the left:

5x+2x-9-(12)=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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