why is any real number a solution for the equation 8y - 30 = 4(2y - 7.5)
your equation is an identity, since if you work it out you get
0 = 0 which is true
8y - 30 = 4(2y - 7.5
8y - 30 = 8y - 30
0 = 0
0 = 0 which is true
8y - 30 = 4(2y - 7.5
8y - 30 = 8y - 30
0 = 0