21=7x+28

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Solution for 21=7x+28 equation:



21=7x+28
We move all terms to the left:
21-(7x+28)=0
We get rid of parentheses
-7x-28+21=0
We add all the numbers together, and all the variables
-7x-7=0
We move all terms containing x to the left, all other terms to the right
-7x=7
x=7/-7
x=-1

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