{5×[(2^9×30^101)^3 : (2^303×15^303)+ a - (2^3)^9]} : 2 = 25
( 2^9 × 2^101 × 15^101)^3 : (2^303 × 15^303) + a - 2^27 = 25 × 2 : 5
( 2^110 × 15^101)^3 : (2^303 × 15^303) + a - 2^27 = 50 : 5
(2^330 × 15^303) : (2^303 × 15^303) + a -2^27 = 10
2^330 : 2^303 × 15^303 : 15^303 + a - 2^27 = 10
2^(330-303) × 1 + a - 2^27 = 10
2^27 + a - 2^27 = 10
a = 10 ( pata din exercitiu )
______
