(3y + 41) × 28 - 248 = 3000
(3y + 41) × 28 =3000+248
(3y + 41) × 28=3248
3у+41=3248 :28
3у+41=116
3у=116-41
3у=75
у=75 :3
у=25
17(2x-15)+82=3193
17(2х-15)=3193-82
17(2х-15)=3111
2х-15=3111 :17
2х-15=183
2х=183+15
2х=198
х=198 :2
х=99
21x-5x-84=940
16х=940+84
16х=1024
х=1024 :16
х=64