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= 13a + 21a - 8b + 9b
= 34a + b
b. (15i - 14j + 13k) + (-30i - 45j + 51k)
= 15i - 30 i - 14j - 45j + 13k + 51k
= -15i - 59j + 64k
c. (3x - 17y + 35z) + (4x + 23y - 9z)
= 3x + 4x - 17y + 23y + 35z - 9z
= 7x + 6y + 26z