2x+5x-21=28

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Solution for 2x+5x-21=28 equation: 



2x+5x-21=28

We move all terms to the left:

2x+5x-21-(28)=0

We add all the numbers together, and all the variables

7x-49=0

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

7x=49

x=49/7

x=7

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