7x-21=3x+9

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Solution for 7x-21=3x+9 equation:



7x-21=3x+9
We move all terms to the left:
7x-21-(3x+9)=0
We get rid of parentheses
7x-3x-9-21=0
We add all the numbers together, and all the variables
4x-30=0
We move all terms containing x to the left, all other terms to the right
4x=30
x=30/4
x=7+1/2

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