Answer:
SO MY LAST ANSWER GOT REMOVED I DONT KNOW WHY. SO I AM DOING IT AGAIN
Explanation:
2a + 6 - a
SO ,
2a - a + 6 --> { "a" CAN ALSO BE WRITTEN AS "1a". THEREFORE "2a-1a=a"}
a + 6 IS THE FINAL ANSWER
OR FUTHER SIMPLIFYING THIS
a= -6{SIGN CHANGES AFTER CHANGING THE DIGITS POSITION}