3+7x-10=21

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Solution for 3+7x-10=21 equation: 



3+7x-10=21

We move all terms to the left:

3+7x-10-(21)=0

We add all the numbers together, and all the variables

7x-28=0

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

7x=28

x=28/7

x=4

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