Whenever you subtract anything from itself, you'll
always wind up with zero. Even outside of algebra !
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It is 6a.
8a-a-a = 6a
The Answer is 4a so you are asking why it is 4a. So just take an a and think it as 1a boom
36a2 - 60a + 25 = 36a2 - 30a - 30a + 25 = 6a(6a - 5) - 5(6a - 5) = (6a - 5)(6a - 5) = (6a - 5)2
10a-37=6a+51 -6a -6a subtract 6a from both sides and the 6a's cancel 4a-37=51 +37 +37 4a=88 /4 /4 a=22