16(x-2)*(x-2)=9(x+3)*（x+3） ==> 16(x-2)*(x-2) - 9(x+3)*（x+3）= 0 ==> [4(x - 2) + 3(x+ 3)] * [4(x - 2) - 3(x+ 3)] = 0 ==> [7x + 1] * [x - 17] = 0 ==> x = -1/7 ,17