Respuesta :

Amarokwolf

Answer:

9. x= 9

10. x= 9

Step-by-step explanation:

9. 13x+12= 129

    13x=129-12

       x=117/13=9

10.180-(7x-10)= 12x+19

     180-7x+10=12x+19

     190-7x=12x+19

     190=19x+19

     190= 19(x+1)

     190/ 19=x+1

     10=x+1

     9=x

sejayadav2111

Answer:

9. 13x+12 = 129

=> x=117/13 = 9

10.7x-10+(12x+19)= 180

19x+9= 180

x= 171/19

= 9