Can anyone tutor me on linear equations?

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48