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a. 2x + y = 3 dan x - 3y = 5
b. 2x + 3y = 1 dan x - y = -2
c. 2x + 5y = -8 dan 4x - 2y - 8 = 0
d. 2x - y = -9 dan x + y = 6
e. 4x - 2y - 8 = 0 dan 2x - 5y = -8
jika A = {x|x ≤ 10, x E B} maka A' = {x|11 ≤ x ≤ 20, x E S}