Try another version of this question Solve the system of equations. If the system has an infinite number of solutions, express them in terms of the parameter z. Get help:
`{(-7x,-,5y,-,z,=,-55),(-16x,-,17y,+,20z,=,-148),(-4x,-,5y,+,8z,=,-40):}`
x =
y =
z =
`5-3z`
`4+4z`
`z`