7x-20=21

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Solution for 7x-20=21 equation: 



7x-20=21

We move all terms to the left:

7x-20-(21)=0

We add all the numbers together, and all the variables

7x-41=0

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

7x=41

x=41/7

x=5+6/7

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