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V1 + V2 = 10
V1 - V2 = 50
V1 + V2 = 10
V1 = 10 -V2
Disubstitusi ke persamaan 2
(10 -V2)-V2=50
10-2V2=50
-2V2 = 40
V2 = -20
nilai V2 disubstitusi lagi ke salah satu persamaan
V1 + (-20) = 10
V1= 30
Jadi V1 = 30 dan V2 = -20