Answer :
19 = 5x - 1
20 = 5x [combine like terms/addition property of equality]
4 = x [division property of equality]
20 = 5x [combine like terms/addition property of equality]
4 = x [division property of equality]
Just took the test, the answers are:
19 = 5x - 1 / Given
20 = 5x / Addition Property of Equality
4 = x / Division Property of Equality