The point where things start settling down in the story
6x + ( 3x - 9) = 90°( being complementary angles )
6x+3x -9 = 90°
9x = 90° + 9
x = 99 / 9
x = 11
3x +6 = x^2-2x
x^2-5x-6 =0 , which is quardic equation..
solving , we will get, x = 6 or x= -1
hope it helped
Answer:
I think ti is 15 i fi am wrong I am sorry
It is the Commutative Law.