(-3x-1/2)(1/2-3x)=x(9x-1/5)
(-3x-1/2)(-3x+1/2)=x(9x-1/5)
(-3x)²-(1/2)²=9x²-x/5
9x²-1/4=9x²-x/5
x/5=1/4
x=5/4