6 5 / 18 - (4 5 / 18-0.63) simple calculation method

6 5 / 18 - (4 5 / 18-0.63) simple calculation method

6 5 / 18 - (4 5 / 18-0.63)
=6 5 / 18-4 5 / 18 + 0.63
=2+0.63
=2.63