using a graphical tool
the solution is (-0.05,-1.6) see the attached figure
proceed to check it
f(x)=−32x
g(x)=(12)x−1
f(x)=g(x)-------------- >-32x=12x-1----------- > 20x=-1---------> x=1/20=-0.05
f(x)=32*(-1/20)=-32/20=-8/5=-1.6
the solution is the point (-0.05,-1.6) (see the attached figure)