the equation is s/12-s/2= 5s/4. I punched in the LCD which is 12 but when I look to check in the back of my book it says the answer for the equation is 0.

I think there is some misprinting in the question

s/12 - s/12 = 0

s/12 - s/2

take lcm

if s/12 - s/2 = (s-6s)/12 = -5s/12

if s/2 - s/12 = (6s-s/12 = 5s/12

it cant be 5s/4

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