To simplify the expression, we can first find the least common denominator (LCD) of the fractions in the parentheses, which is 565656 * 727272 * 909090.

Then, we can rewrite each fraction with the LCD as the denominator:

131313/565656 = (131313 * 727272 * 909090) / (565656 * 727272 * 909090)
131313/727272 = (131313 * 565656 * 909090) / (565656 * 727272 * 909090)
131313/909090 = (131313 * 565656 * 727272) / (565656 * 727272 * 909090)

Now, we can simplify the expression:

A = 70 * [(131313 * 727272 * 909090) / (565656 * 727272 * 909090) + (131313 * 565656 * 909090) / (565656 * 727272 * 909090) + (131313 * 565656 * 727272) / (565656 * 727272 * 909090)]

Since the denominators are the same, we can combine the numerators:

A = 70 * [(131313 * 727272 * 909090 + 131313 * 565656 * 909090 + 131313 * 565656 * 727272) / (565656 * 727272 * 909090)]

Now, we can simplify the numerator:

A = 70 * [(131313 * 909090 * (727272 + 565656 + 727272)) / (565656 * 727272 * 909090)]

Simplifying further:

A = 70 * [(131313 * 909090 * 2020200) / (565656 * 727272 * 909090)]

Now, we can cancel out common factors:

A = 70 * (131313 * 2020200) / (565656 * 727272)

Finally, we can simplify the expression:

A = (70 * 131313 * 2020200) / (565656 * 727272)

A ≈ 70.