[(-2)(+4)-(+1)]-{(+2)-[(+3)+(-4)]
=−8−1−(2−(3−4))
=−9−(2−(3−4))
=−9−(2−(−1))
=−9−3
=−12
R//-12
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[(-2)(+4)-(+1)]-{(+2)-[(+3)+(-4)]
=−8−1−(2−(3−4))
=−9−(2−(3−4))
=−9−(2−(−1))
=−9−3
=−12
R//-12