To simplify the expression, we can simplify each square root individually and then combine like terms.

√(28) = √(4 * 7) = √4 * √7 = 2√7
√(80) = √(16 * 5) = √16 * √5 = 4√5
√(147) = √(49 * 3) = √49 * √3 = 7√3
√(245) = √(49 * 5) = √49 * √5 = 7√5
√(98) = √(49 * 2) = √49 * √2 = 7√2

Now we can substitute these simplified values back into the expression:

2√(28) - 3√(80) - 5√(147) + 5√(245) - 3√(98)
= 2(2√7) - 3(4√5) - 5(7√3) + 5(7√5) - 3(7√2)
= 4√7 - 12√5 - 35√3 + 35√5 - 21√2

So the simplified expression is 4√7 - 12√5 - 35√3 + 35√5 - 21√2.