700 - х = 56 * 8
700 - х = 448
х = 700 - 448
х = 252
700 - 252 = 56 * 8
448 = 448
а - 100 = 2352 / 98
а - 100 = 24
а = 24 + 100
а = 124
124 - 100 = 2352 / 98
24 = 24
63 *(80 -а) = 693
5040 - 63а = 693
63а = 5040 - 693
63а = 4647
а = 4347 / 63
а = 69
63*( 80 - 69) = 693
693 = 693
(х + 420) /8 = 56
(х + 420) = 56 * 8
х+420 = 448
х = 448 - 420
х = 28
(28 +420) / 8 = 56
56 = 56