Respuesta :

itselliot360

Answer:

x= 12.857

Step-by-step explanation:

80=5x + 2x -10  combine like terms

80= 7x -10 distributed 10 to both sides

90 =7x  divide both sides by 7

12.857 =x    

denbree

Answer:

x = 12 6/7 or 90/7

Step-by-step explanation:

5x + 2x - 10 = 80

^^add you like terms (5x + 2x)

7x - 10 = 80

add -10 to both sides so it cancels out

7x = 90

divide 7 from both sides to get x by itself

x = 12 6/7