x−3=3−xx-3=3-x
1
Add 33 to both sides.
x=3−x+3x=3-x+3

2
Simplify  3−x+33-x+3  to  6−x6-x.
x=6−xx=6-x

3
Add xx to both sides.
x+x=6x+x=6

4
Simplify  x+xx+x  to  2x2x.
2x=62x=6

5
Divide both sides by 22.
x=62x=\frac{6}{2}

6
Simplify  62\frac{6}{2}  to  33.
x=3x=3

Done

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