(-3.9х2.8+26.6):(-3.2)-2.1=(-10.92+26.6):(-3.2)-2.1=15.68:(-3.2)-2.1=-4.9-2.1=-7
6^3-3*6^2+3*6= 216-3*36+3*6= 216-108+18=108+18=126
1) 248-16+16x=536
16x=536-248+16
16x=304
x=304÷16
x=19
2)551-45+35x=1101
35x=1101-551+45
35x=595
x=595÷35
x=17
3)99+12x-24=231
12x=231-99+24
12x=156
x=156÷12
x=13
4)822-396-27x=48
-27x=48-822+396
-27x=-378
x=(-378)×(-27)
x=10206
5)81+21x-42=270
21x=270-81+42
21x=231
x=231÷21
x=11
6)302+340+20x=922
20x=922-302-340
20x=280
x=280÷20
x=14