If 2a-9=-85 what is the value of the variable

Hi, it is very simples.

Look :

2a - 9 = -85

Pass the term -9 to the left side of equation, but changing the sinal

2a = -85 + 9

Sum -85 +9 = -76

Then,

2a = -76

Nos, pass the 2 dividing -76

a = -76 ÷ 2

a = - 38

This is the answer to the yours question

Solution/ a=-38.
Since its a subtraction problem you need to add.
-9 + 9 cancels each other out which takes u back to 2a.
next you have to add -9 + -85 which gives you -94.
Now you have 2a = -94 and 2 divided by 94 gives you -38, and 2a cancels out so all u have left is "a" which gives you ur answer a=-38