exam Maths Puzzle Numerical Ability

Help me please!! I dont understand how to do this with a fraction:

4a+3/4=19/4

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exam Other Question

Which of the following is the solution set of |2x - 3|>4?

A.{x|x<-1/2 or x >7/2} B. {x|x<-1 or x >7}

c. {x|-1/2< x<7/2} D. {x|x<1/2 or x>7/2}
Express result in simplest form


5a - 12
Divided by
a^2 - 8a + 15

minus

3a - 2
Divided by
A^2 - 8a + 15