2{3x-(x-3)}=3(x-3) Can you please show me the steps on how to do this.

The left side, when multiplied out, becomes

6x -2x +6 , which is 4x +6
The right side is 3x - 9.

The equation then becomes
4x + 6 = 3x -9
which is equivalent to
x = -15

That is the solution