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300 − {−(−484) + (−1) − [−0 − (10 − 220)] − [1213 + (−345)]} =​

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300 − {−(−484) + (−1) − [−0 − (10 − 220)] − [1213 + (−345)]} =

=300−(484−1−(−0−(10−220))−(1213−345))

=300−(483−(−0−(10−220))−(1213−345))

=300−(483−(0−(10−220))−(1213−345))

=300−(483−(0−(−210))−(1213−345))

=300−(483−210−(1213−345))

=300−(273−(1213−345))

=300−(273−868)

=300−(−595)

=895

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