Answer:
9[tex]x^{2}[/tex]-3x-12
9[tex]x^{2}[/tex]+6x-7-9x-5
(Group liked terms)
9[tex]x^{2}[/tex]+6x-9x-7-5
( subtract the numbers ) -7-5= -12
9[tex]x^{2}[/tex]+6x-9x-12
( add similar elements ) 6x-9x=-3x
9[tex]x^{2}[/tex]-3x-12
Step-by-step explanation:
