If 2A-7B = 8C+4D then
4D = 2A-7B-8C
4D = 2(7i-6k) - 7(5j+6k) - 8(-7i+5j-2k)
4D = 14i-12k-35j-42k+56i-40j+16k
now finish it off
Let A = 7i - 6k, B = 5j + 6k, and C = -7i + 5j - 2k. Find vector D such that 2A - 7B = 8C + 4D.
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