You seem to be asking what 12/28 is. In lowest terms, it is 3/7. As a decimal, it is 0.428571... The 6 digits 428571 repeat forever. Rounded to 3 decimal places, it is 0.429.
28=8x+12-7x 28=8x-7x+12 28=x+12 28-12=x+12-12 16=x
x + (-12) = 28 So x = 28 + 12 = 40
3/7 of 28 = 28*3/7 = 12
-12+28 = 16
28 + 12 = 40
12/28 or 3/7
28/12 = 2.33 or 233%
28
LCM of 12 and 28 is 84.
12 out of 28 is 42.86%
28 x 12 = 336
-0.42857142857143 x -28 = 12