Respuesta :
5 because if you plug in to get the equation 3x+20=7x then subtract 3x from both sides and divide by 4 from both sides
Answer:
x =5 is the answer
Step-by-step explanation:
m =7x
m =3x+20 , it will be solved by substituting method
substituting m=7x in m=3x+20
7x =3x+20
7x-3x =20
4x =20
divide by 4 ,we get
x =5
