Answer:
-3r+1/4
Step-by-step explanation:
3/4-4r+1/2r-1 x 1/2+1/2 x r
3/4-4r+1r/2-1x1/2+1/2 x r
3/4-4r+ 1r/2-1x1/2+1/2 x r
3/4-4r+ r/2-1 x 1/2 +1/2 x r
3/4-4r+r/2-1 x 1/2+1/2 x r
3/4-4r+r/2-1/2+1/2 x r
3/4-4r+r/2-1/2+1/2r
3/4-4r+r/2-1/2+1r/2
3/4-4r+r/2-1/2+1r/2
3/4-4r+r/2+r/2
3/4-4r+r/2-1/2+r/2
1/4-4r+r/2+r/2
1/4-4r+ 2xr/2 (two times r/2 equals r)
1/4-4r+r
1/4-4+r
1/4-3r
1/4-3r
-3r+1/4
-3r+1/4
and that's how you get your answer.
i hope this helps.
:)