6a + 5a = -11
11a = -11
a = -11/11 = -1
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4.8
A= 2
So we have 5a + 11 + 3a - 7 = -4 Start by combining common terms such as the 5a and 3a to give you 8a and 11 and -7 to give you 4. So now your equation is 8a + 4 = -4. Subtract 4 from both sides gives you 8a = -8. Divide -8 by 8 to give you a = -1, your solution.
2a+5a+9a = 16a
a = 0