2(x+3)^2×3(x+3)^2=36(x-2)^2
6(x+3)^2=36(x-2)^2
(x+3)^2=6(x-2)^2
x^2+6x+9=6(x^2-4x+4)
x^2+6x+9=6x^2-24x+24
-5x^2+30x-15=0
x^2-6x+3=0
x=(6±2√6)/2
x1=3+√6
x2=3-√6
9(x+1)^2-3*2x^2=72
9(x^2+2x+1)-6x^2=72
3x^2+18x-63=0
x^2+6x-21=0
x=(-6±2√30)/2
x1=-3+√30
x2=-3-√30