3x-5=2，，
3x-5+5=2+5，
3x=7，
3x÷3=7÷3，
x=73．
故答案为：73．
I usually get up ________ 7:00 ________ the morning. [ ]
A. in; at
B. at; in
C. in; in
D. at; on
A．mgtgθ
B．mgsinθ
C．μmg
D．μmg
mgtgθ
mgsinθ