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^2}=sqrt{36})
take the square root of both sides

So x+3 equals positive 6 or negative 6 so:
Evaluate x+3=6

Subtract 3 from both sides

Evaluate the right side
So x=3
Evaluate x+3=-6

Subtract 3 from both sides

Evaluate the right side
So our answer is:
x=3 or x=-9