7+28x=28+21x

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Solution for 7+28x=28+21x equation: 



7+28x=28+21x

We move all terms to the left:

7+28x-(28+21x)=0

We add all the numbers together, and all the variables

28x-(21x+28)+7=0

We get rid of parentheses

28x-21x-28+7=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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