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b. 4a+b-3c-d + (2a+3b-2c+3d) = 6a+4b-c+2d
c. 3a+5b+3c+6d + (6a-7b-7c-2d) = 9a-2b-4c+4d
d. 5p+2r-3s+6t + (7p-2r-3s-6t) = 12p-6s
e. 4x-2y-4z-8 + (4x+2y+5z+8) = 8x+z
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