3-2b/a+b*9b+9a/4b^2-9-6b/2b+3

1) 3-2в/а+в*9в+9а/4в^2-9= (3-2в)*9(а+в)/(а+в)*(2в-3)(2в+3)= -9/2в+3
2)-9/2в+3-6в/2в+3= -9-6в/2в+3=-3(3-2в)/2в+3)