SASMO 2017 Secondary 3 (Grade 9) Contest Question 3

i It can be shown that 5 = 4 by the following steps:
: (1) —20 = ~20
i (2) 25-45 = 16 — 36
: (3) 5?-5x9=42-4x9
eS (4) St-sx94S=4-4x945
{ 2 2
©) (342) (4-3)
©) s-3=4-2
(7) 5=4
Which transition step is wrong?
' A. (2) to (3)