9x+6-(3x-4)(x+2)=36-3x²

9x+6-(3x-4)(x+2)=36-3x² 9x+6-3x+4+x+2=36-3x² 7x+12=36-3x² 7x+3x²=36-12 10x2=24 x2=2,4 x2=x²

9x+6-(3x-4)(x+2)=36-3x² 9x+6-3x²-6x-4x-8=36-3x² 9x+6-6x-4x-8=36 |-6,+8, 9x-6x-4x=36-6+8 3x-4x=38 -1x=38|:-1 x=-38