Question 402215
5a + 1/(4a+6) = 3/4
5a + 1/(2(2a+3)) = 3/4
multiply both sides by 4(2a+3) 
5a(4(2a+3)) + 2 = 3(2a+3)
5a(8a+12) + 2 = 3(2a+3)
40a^2+60a + 2 = 6a+9
40a^2+54a + 2 = 9
40a^2+54a-7 = 0
apply the "quadratic formula" to get:
a = {0.119, -1.469}
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Details of quadratic:
*[invoke quadratic "a", 40, 54, -7 ]