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4x - y = 21 l x5 l 20x - 5y = 105 +
26x = 130
x = 5
4x - y = 21
4(5) - y = 21
20 - y = 21
- y = 21 - 20
y = -1
dengan x = 5 dan y = -1 maka
x + 3y = 5 + 3(-1) = 2