To solve for "a" in the equation A-3.2/2a+1.4=0.9/2.7, follow the steps below:

Subtract 1.4 from both sides of the equation:
A-3.2/2a = 0.9/2.7 - 1.4

Combine the terms on the right side:
A-3.2/2a = 0.3333 - 1.4

Simplify the right side:
A-3.2/2a = -1.0667

Multiply both sides by 2a to get rid of the fraction:
2a(A) - 3.2 = -2.1334a

Move all terms containing "a" to one side of the equation:
2a(A) + 2.1334a = 3.2

Factor out the "a" on the left side:
a(2A + 2.1334) = 3.2

Divide both sides by (2A + 2.1334) to solve for "a":
a = 3.2 / (2A + 2.1334)

Therefore, the solution for "a" in the equation A-3.2/2a+1.4 = 0.9/2.7 is a = 3.2 / (2A + 2.1334).