16 over 9 or 1 and 7 over 9.
16 / 8 + 2 * 5 - 21 / 7 = 2 + 10 - 3 (multiplication and division first) = 9
2519
7
7
That's the same as 8/9 x 18/9 = 144/81 = 16/9 or 1 and 7/9
9+8+7 = 24, divided by 3 (the amount of numbers) = 8
16
9/7 9/8 16/7 16/8 are all common
1.7778
7/16 divided by 9/10 = 7/16 x 10/9 = 70/144 You invert the divisor fraction, then do a multiplication instead of division.
2r - 7 = 9 (+7) (+7) >> add 7 to both sides so that only 2r is on that side 2r = 16 2r/2 = 16/2 >> divide both sides by 2 to isolate the variable r=8 >>16 divided by 2 is 8 which is your answer