What is 1 2/3 - 2 1/3

Can some one me with these questions

Examine the two-step equation. − 7 4 + x 4 = 2 which property of operations allows you to add the same constant term to both sides? amultiplication property of equality bdivision property of equality caddition property of equality dsubtraction property of equality

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read