When you want to learn a language, you should learn from the ________ words.
A:basic
B:difficult
C:large
①找借口,暂时走开
②为了面子,跟着大家抽一支
③说谢谢,并婉言谢绝
④接过来,感受一下也无妨
如果一个数的3倍减去7,等于这个数的2倍加上5,设这个数为x,则用一元一次方程可表示为____.