Verified answer

1. 34х+66х=100х; 100*8=800

2. 54а-39а=15а; 15*26=390

3. 18m-5m+7m=20m; 20*394=7880

4. 19z-12z+33z-192=40z-192; 40*82-192=3088

1. = 34*8+66*8=272+528=800

2. = 1404-1014=390

3.= 7092-1970+2758=7880

4.= 1558-984+2706-192=3088