A=[12-(-3)]-[3-(-20)+(-3)]
=>A=12+3-(3+20-3)
=>A=12+3-3-20+3
=>A=15-3-20+3
=>A=12-20+3
=>A=-8+3
=>A=-5
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A=[12-(-3)]-[3-(-20)+(-3)]
=>A=12+3-(3+20-3)
=>A=12+3-3-20+3
=>A=15-3-20+3
=>A=12-20+3
=>A=-8+3
=>A=-5