Please help me solve.

 = -7

Divide both sides by -9

 = 

Cancel the 's on the left and the 
negative signs on the right:

 = 

Take the square roots of both sides:

 = 

 = 

 =  

which breaks into two equations:

x-3 = ,  x-3 = -

Solving the first:

x - 3 = 

Add 3 to both sides

    x = 3 + 

    x =  + 

    x = 

That's one solution.

Solving the second:

x - 3 = 

Add 3 to both sides

    x = 3 - 

    x =  - 

    x = 

That's the other solution.

Edwin