book Maths Puzzle Numerical Ability

I am trying this problem solve -5/4x+1/4x=2x+1/2=3/4x and I am very confused.

Read Solution (Total 0)

book Other Question

(log v3 81)*(log v81 3)=1 I have not idea if this one is true or false. Any ideas? What is the x-intercept of the line with the equation 4x+2y=12?
This is a multiple choice A. (6,0) B.(0,3) C.(0,6) D.(3,0)