x2+(x-3)-x^2+3x-21=0

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Solution for x2+(x-3)-x^2+3x-21=0 equation: 



x2+(x-3)-x^2+3x-21=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x+x-3-21=0

We add all the numbers together, and all the variables

4x-24=0

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

4x=24

x=24/4

x=6

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