28) х+1232=4054-2024
х+1232=2030
х=2030-1232
х=798
798+1232=4054-2024
17487÷(х+56)=87
х+56=17487÷87
х+56=201
х=201-56
х=145
17487÷(145+56)=87
х+3456÷64=8586÷54
х+3456÷64=159
х=159-54
х=105
105+3456÷64=8586÷54
29)х+552=5243-1354
х+552=3889
х=3889-552
х=3337
3337+552=5243-1354
63×(2805-а)=945
2805-а=945÷63
2805-а=15
а=2805-15
а=2790
63×(2805-2790)=945
(7887-х)÷66=12348÷126
(7887-х)÷66=98
7887-х=98×66
7887-х=6468
х=7887-6468
х=1419
(7887-1419)÷66=12348÷126
30)2545+х=1550+5434
2545+х=6984
х=6984-2545
х=4439
2545+4439=1550+5434
(х+12484)÷324=46
х+12484=324×46
х+12484=14904
х=14904-12484
х=2420
(2420+12484)÷324=46
х+780×27=28×970
х+780×27=27160
х=27160-21060
х=6100
6100+780×27=28×970