7x-21-2x=4

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Solution for 7x-21-2x=4 equation: 



7x-21-2x=4

We move all terms to the left:

7x-21-2x-(4)=0

We add all the numbers together, and all the variables

5x-25=0

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

5x=25

x=25/5

x=5

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