Let x be the fraction you seek.
x + 2/3 = 9/10
Find common denominator:
x + 20/30 = 27/30
x = 7/30
Check:
7/30 + 20/30 = 27/30
27/30 = 27/30
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2 over 58 over 2012 over 30etc....equivalent to 4 over10 = 2/5
4/10 = 2/5 as a fraction in its simplest form
yes it is if you multiply 2 over 5 by 2 then it would equal 4 over 10
1 and 1 over 3
5/4