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=13a+12a-8b+9b
=25a+b
b. (15i+14b+13k)+(-30i-45j+51k)
=15i-30i+13k+51k+14b-45j
=-15i+64k+14b-45j
-8b + 9b = 1b atau b
jadi, jawabannya adalah 25a + b