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V(7 - 2V12) = V(4+3 - 2V4 . 3) = V4 - V3
V(6 - 2V8) = V(4 + 2 - 2V4 . 2) = V4 - V2
dengan demikian,
V(5 - 2V6) - V(7- 2V12) - V(6 - 2V8)
= V3 - V2 - (V4 - V3) - (V4 - V2)
= V3 - V2 - V4 + V3 - V4 + V2
= -2 V4 + 2V3
= - 2 (2) + 2V3
= -4 + 2V3