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1/2x-1/4y=2 -> 2x+y=8
Maka:
4x -3y=36 (x 1) 4x -3y =36
2x+y=8 (x 2) 4x +2y = 16
dieliminasi
-5y = 20
y = -4
x = 6
a - 2b = x - 2y = 6 - 2(-4) = 6+8 = 14 (C)