Add: 5b – 2c – d +3; 2b − c + 3d - 4 and b + 3c – 4d + 7
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answer is 8b
(5b-2c-d+3)+(2b-c+3d-4)+(b+3c-4d+7)
5b-2c-d+3+2b-c+3d-4+b+3c-4d+7
5b+2b+b-2c-c+3c-d+3d-4d+3-4+7
8b
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