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(15i+14b+13k)+(-30i-45j+51k)=
=15j+14b+13k-30i-45j+51k
= -30j+64k+14b-45j
25a + b
14b + 15i - 30i - 45j + 13k + 51k =
14b - 15i - 45j + 64k