9x-21+4x=28

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Solution for 9x-21+4x=28 equation: 



9x-21+4x=28

We move all terms to the left:

9x-21+4x-(28)=0

We add all the numbers together, and all the variables

13x-49=0

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

13x=49

x=49/13

x=3+10/13

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