f(x)=-2x+7 dan f(k)=17 maka nilai k adalah?

f(k)=-2(k)+7
17=-2(k)+7
17=-2k+7
17-7=-2k
10=-2k
10/(-2)=k
-5=k
maaf kalo salah:))

f(x) = -2x + 7
f(k) = -2k + 7
f(k) = 17
berarti :
-2k + 7 = 17
-2k = 17-7
- 2k = 10
-k = 10/2
-k = 5
k = -5