2a + b - c
=2(i+2j+3k) + (-3i-2j-k) - (i-2j+3k)
=2i+4j+6k-3i-2j-k-i+2j-3k
=2i-3i-i+4j-2j+2j+6k-k-3k
=-2i+4j+2k
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2a + b - c
=2(i+2j+3k) + (-3i-2j-k) - (i-2j+3k)
=2i+4j+6k-3i-2j-k-i+2j-3k
=2i-3i-i+4j-2j+2j+6k-k-3k
=-2i+4j+2k