Объяснение:
0,5×(х+3)^(lg(х+3))=5
(х+3)^(lg(х+3))=5/0,5
(х+3)^(lg(х+3))=10
(х+3)^(lg(х+3))=10¹
x+3=10 ; lg(x+3)=lg10=1
x=10-7=7
x=7
