Answer :

im assuming this equation is set equal to 0 because you gave no indication of what it is set to. 
4a+1(9a+3)=0
4a+9a+3
13a=-3
a=-3/13
4a+(9a+3)=0
4a+9a+3=0
13a+3=0
13a=-3
a=-3/13
a=-0.23

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