Answer:
a = 15
Explanation:
8a + 2a + a + 15 = 180
What is the value of a?
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To solve this, we first need to do everything to get "a" alone.
8a + 2a + a + 15 = 180
Add like terms :
8a + 2a + a
11a
11a + 15 = 180
Subtract 15 from both sides :
11a = 165
Divide 11 from both sides to get "a" alone :
a = 15