find the lcd first. do it this way.
>>432(LCD)÷18 x 19 = 456
>>432÷24 x 15 = 270
>>> 456-270/432
= 186/432 (divide the numerator and denaminator to 6)
.... therfore the answer is 31/72
19/18+(-15/24) first you apply the function of multiplication by the sign 19/18-15/24 =76-45/72 second you find the lcd or the less common denominator 31/72 third subtract it then you get the answer.
