15. (2z - 7) - 3(3z + 8) = 4z -9 16. 4(2y - 3) + 5(3y - 4) = 14
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3x + 4y + 5z = 26 2x + 6y - 4z = 2 4x + 2y + 3z = 19 As before, we ... 3x + 4y + 5((19/3) - (4/3)x - (2/3)y) = 26 2x + 6y - 4((19/3) - (4/3)x - (2/3)y) = 2 And ... 6 new equations: x - 64t = -63 y - 32t = 31 -z + 16t = 15 -w + 8t = 7 -r + 4t = 3 -s + 2t.
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