Answers!
6x + 3 = 5
6 x 1/3 + 3 = 5
6 x 1/3 - 3 = [-1]
so the unknown number was 1/3
Comment
Answer the question...
6x + 3 = 5
6 x 1/3 + 3 = 5
6 x 1/3 - 3 = [-1]
so the unknown number was 1/3
Comment