12а-3в÷12а+3в при= -3/4 в =-5/6

To evaluate the expression 12а-3в÷12а+3в when в is equal to -5/6, we substitute -5/6 for в in the expression:

12а - 3(-5/6) ÷ 12а + 3(-5/6)

Simplifying:

12а + 5/2 ÷ 12а - 5/2

To divide fractions, we can multiply the first fraction by the reciprocal of the second:

(12а + 5/2) * (2/12а - 5)

Expanding:

24а/12а + 10/12а - 120а - 25/12а - 25

Simplifying:

2 + 10/12а - 120а - 25/12а - 25

Combining like terms:

(2 - 25) + (10/12а - 25/12а) - 120а

-23 + (10 - 25)/12а - 120а

Simplifying the fraction:

-23 + (-15)/12а - 120а

-23 - 5/4а - 120а

To simplify further, we need the value of а. Once you provide the value of а, we can continue evaluating the expression.