Answer:
7/30
Step-by-step explanation:
x + 2/3 = 9/10
x = 9/10 - 2/3
x = 27 / 30 - 20 /30
x = 7/30
=> x = 9/10 - 2/3
=> x = 27/30 - 20/30
=> x = 7/30
