5ab & # 178; - {2A & # 178; B-3 [AB & # 178; - 2 (2Ab & # 178; + A & # 178; b])}, where a and B satisfy | a + 1 | + (b-2) &# 178; = 0

5ab & # 178; - {2A & # 178; B-3 [AB & # 178; - 2 (2Ab & # 178; + A & # 178; b])}, where a and B satisfy | a + 1 | + (b-2) &# 178; = 0

a. If B satisfies | a + 1 | + (b-2) & # 178; = 0, then a = - 1, B = 2, so: 5ab & # 178; - {2A & # 178; B-3 [AB & # 178; - 2 (2Ab & # 178; + A & # 178; B])} = - 20 - {4-3 [- 4-2 (- 8 + 2])} = - 20 - {4-3 [- 4-2 (- 6])} = - 20 - {4-3 [- 4 + 12]} = - 20 - {4-3 [8]}