2.28:{3.76+2.3 - (0.7:7/9*5/3) }

2.28:{3.76+2.3 - (0.7:7/9*5/3) }

first turn 0.7 into a fraction > 7/10

then divide 7/10 and 7/9 > 7/10 / 7/9 > flip 7/9 and multiply 7/10 by its reciprocal > 7/10 x 9/7 = 9/10

the equation should now look like this

2.28:{3.76+2.3 - (9/10*5/3) }

next multiply 9/10 and 5/3 to get 3/2. now turn 3/2 into a decimal. > 1.5

2.28:{3.76+2.3 - (1.5) }

now add 3.76+2.3 to get 6.06.

2.28: (6.06-1.5)

subtract 1.5 from 6.06 to get 4.56

2.28:4.56 = 0.5

0.5 is your answer