Music from what culture has a 5-tone tonality?

Chinese

Explanation:

Chinese instruments were originally made out of natural compononents, wood, stone, animal hair, etc.

They used a pentatonic scale, which means there are no semi tones from any note to the other. Visually this is represented only playing on the black notes on the keyboard or piano.

The pentatonic or 5 tone scale transmitts the idea associated to the elements of nature as seen in the image below, each elements has a special and deeply rooted meaning in the Chinese traditions and folklore.

In the traditional Chinese music A pentatonic scale is a musical scale with five notes per octave, to be contrasted with the Western heptatonic system

The second image provides the equivalence and visual representing of the notes

a

explanation:

simplify brackets

8 - 2a - 7 = a + 40

simplify 8 - 2a - 7 to -2a + 1

-2a + 1 = a + 40

add 2a to both sides

1 = a + 40 + 2a

simplify a + 40 + 2a to 3a + 40

1 = 3a + 40

subtract 40 from both sides

1 - 40 = 3a

simplify 1 - 40 o -39

-39 = 3a

divide both sides by 3

-39/3 = a

simplify 39/3 to 13

-13 = a

switch sides

a = -13