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b = 6i - 8j
c = 5i - 7j
soal 2a - b + 3c?
= 2(3i + 2j) - (6i - 8j) + 3(5i - 7j)
= (6i + 4j) - (6i - 8j) + (15i - 21j)
= (6i - 6i + 15i + 4j + 8j - 21j)
= 15i - 9j