Hi, here is a question and my answer I have done so far, not sure about the end result so any help

Hi, here is a question and my answer I have done so far, not sure about the end result so any help appreciated 5a-2 (5+4a)=-9 Multiply out brackets 5a-10+8a =-9 Add 10, 5a+8a=1 Collect like terms 13a = -9 Divide by 13 = a =1/13 I am pretty sure the answer should be a = -1/3 but not sure how to get there, , thanks

 

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