Answer:
a = 20
Explanation:
1/2a - 4 = 6
1/2a = 10 (bring -4 to the other side)
a = 20 (times 2 by 10)
a = 20 is the answer
+4 +4
--------------------
1/2a = 10
*2 *2
---------------------
1a = 20
/1 /1
----------------------
a = 20 -------------------> answer
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