Question

(-12):4-7:(-1)(-12):4-7:(-1)

Answer 1

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(-12):4-7:(-1)(-12):4-7:(-1)

=−3−7:−1(−12):4−7:−1

=−3−(−7)(−12):4−7:−1

=−3−84:4−7:−1

=−3−21−7:−1

=−24−7:−1

=−24−(−7)

=−17