Answer:
3/28
Explanation:
Well basically you plug in x and c with the fractions
c= 6/7 x=3/8
-2x + c (replace the x with 3/8 and replace the c with 6/7)
and you'll will end up with..
-2*3/8 + 6/7
you then have to multiply the -2 and 3/8 (P.E.M.D.A.S)
which gives u -3/-4
you then have the equation -3/-4 + 6/7
sooo
you add it up and u get
3/28
Hope this helps! :)