Question

А-15=300......700-х=500

Answer 1

А-15=300
а=300+15
а=315


700-х=500
700-500=х
200=х

Answer 2

A - 15 =300

a= 300 +15

a =315


700 - x =500

-x = 500 - 700

-x = -200

x = 200