Question

43 < 31 - 2a

Answer 1

subtract both sides by 31 then divide both sides by -2. Don't forgot to change sign.

Answer 2

43 < 31 - 2a
43 - 31 < 2a
12 < 2a
12/2 < a
6 < a

Answer 3

Pardon me, it should be -6 < a. I forgot to move the negative sign with it

Answer 4

43 < 31 - 2a
43 - 31 < -2a
12 < -2a
12/2 < -a
-6 < a

Answer 5

Actually it's -6 > a

Answer 6

do we not write the variable on the left side

Answer 7

You can, it doesn't matter.

-6 > a is same as a < -6

Answer 8

so it should be a > ?

Answer 9

a < -6