Question

T=a-6 make 'a' the subject DOESNT MATTER ANSWERED MY OWN QUESTION!

Answer 1

T=a-6
you can do anything to an equation if you do it to both sides so
T=a-6
add 6 to both sides to get rid of the -6
T+6=a+(6-6)
T+6=a+0
T+6=a