Respuesta :
(9x+12<84)
9x+12-12<84-12
9x<72
=x<8
(2x-6x>-8)
-4x>-8
4x<8
=x<2
and the answer is x<2
9x+12<84 is 9x<72 which is x<7
2x-6x>-8 is -4x>-8 which is x<2
2x-6x>-8 is -4x>-8 which is x<2