tolong ya plis plis plis plis

f (x) = (2m+1)x + 7.
f (-1) = -4
(2m +1)(-1) + 7 = -4
(2m + 1)(-1) = -4 -7
-(2 m + 1) = -11
2m + 1 = 11
2m = 11 - 1
2m = 10
m = 10/2
m = 5