№1.
1) х+36=83
х = 83-36
х = 47
2) 124+у = 212
у = 212-124
у = 88
3) а-458 = 345
а = 345+458
а = 803
4) 2064-b = 1398
b = 2064-1398
b = 666
№2.
1) (x-34)+15 = 61
х-34 = 61-15
х-34 = 46
х = 46+34
х = 80
2) (к-36)-43 = 72
к-36 = 72+43
к-36 = 115
к = 115+36
к = 151
3) (37+d)-58 = 49
37+d = 49+58
37+d = 107
d = 107-37
d = 70
4) 957-(t+336) = 428
t+336 = 957-428
t+336 = 529
t = 529-336
t = 193
5) 325-(а-617) = 219
а-617 = 325-219
а-617 = 106
а = 106+617
а = 723
6) 468-(259-с) = 382
259-с = 468-382
259-с = 86
с = 259-86
с = 173