Yu Yan makes a mistake in line 1
How to solve the expression
The expression is solved as follows
(4(-0.7) + 2/3) / (-2)
The correct expression to expanding line y is
(-2.8 + 2/3) / (-2)
(-14/5 + 2/3) / (-2)
(-32/15) / (-2)
16/15
the correct answer is 16/15