Answer :
f(x)= 2 (x-4) +12
f(x) = 16
16 = 2 (x-4)+12
Apply distributive property:
16 = 2(x)+2(-4)+12
16 = 2x-8+12
Combine like terms:
16 = 2x -8 +12
16 = 2x +4
subtract 4 from both sides of the equation:
16-4 = 2x+4-4
12 = 2x
Divide both sides by 2:
12/2 = 2x/2
6 = x
X=6