1) х-330=25524
х=25524+330
х=25854
2)(75х+2670+90)÷45=63
(75х+2760)÷45=63
(15(5х+184))÷45=63
(5х+184)÷3=63
5х+184=189
5х=189-184
5х=5
х=1
3) (18(8х-98)+2016-268)÷500=4
(144х-1764+2016-268)÷500=4
(144х-16)÷500=4
(4(36х-4)÷500=4
(36х-4)÷125=4
36х-4=500
36х=504
х= 14