1: \(-5+\left(-37-45+51\right)-\left(-37+51\right)\)
\(=-5-37-45+51+37-51\)
\(=-5-45=-50\)
2: \(\left(53-45-49\right)-\left(53+45-49\right)\)
\(=53-45-49-53-45+49\)
=-45-45
=-90
3: \(-15+\left(89+15-72\right)-\left(89-72\right)\)
\(=-15+89+15-72-89+72\)
=-15+15
=0
4: \(-\left(81-32-47\right)+81-\left(32+2\right)\)
\(=-81+32+47+81-32-2\)
=47-2
=45
5: \(50-\left(47+50-18\right)+\left(47-18\right)\)
\(=50-47-50+18+47-18\)
=50-50
=0
6: \(-\left(15-47+58\right)+\left(15-47\right)+3\)
\(=-15+47-58+15-47+3\)
=-58+3
=-55
7: \(13-15+49-13+15-48\)
\(=\left(13-13\right)+\left(15-15\right)+\left(49-48\right)\)
=0+0+1
=1
8: \(-28+32-45-32+28+45-8\)
\(=\left(-28+28\right)+\left(32-32\right)+\left(45-45\right)-8\)
=0+0+0-8
=-8
9: \(42-56+33-\left(33-56+42\right)\)
\(=42-56+33-33+56-42\)
\(=\left(42-42\right)+\left(56-56\right)+\left(33-33\right)\)
=0+0+0
=0
10: \(54-\left(45-30+54\right)-30+5\)
\(=54-45+30-54-30+5\)
=-45+5
=-40
