The answer is Zero.
Something multiplied by 0 is always 0.
If you still do not get it, add 0 to itself 9999999999 times.
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999 + 9999999999 + 9999999999 + 8888888 = 20,008,889,885
The answer is 99'999'999'980'000'000'001.
99,999,999,980,000,000,001
10,000,000,000
88,888,887