Question

b. 3х-1-3х+3х+1 = 63;

Answer 1

3х=63
х=63/3
х=21
ответ х=21

Answer 2

там немного по другому

Answer 3

(1/3)*3^x - 3^x + 3*3^x = 63

3^x * ( 1/3 - 1 + 3) = 63
3^x * (7/3) = 63
3^x = 27, откуда
х = 3

Answer 4

3х-1-3х+3х+1=63
3х=63
х=21