=4 =2 =5
+ =____
- =____
①4x+8=0变形为x+2=0;
②x+6=5﹣2x变形为3x=﹣1;
③ 4x5 =3变形为4x=15;
④4x=2变形为x=2.
根据课文默写古诗文。