Tìm x biết: 96 - 3.(x + 11) = 42

Tìm x,biết:
a,96-3.(x+11)=42
b,15.x-9.x+2.x=72
c,(3^x+2)+3^x=10
d,21-5(x-4)=11
e,(x+3).(2-x)>0
f,(3-x)(x-3)=0