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2x + 2y = 60 di bagi 2 aja jadi x + y = 30(1)
x + 3y = 50(2)
(1) - (2)
-2y = -20
y = 10
Substitusikan
x + 3(10) = 50
x = 50 - 30
x = 20
Jadi untuk 2x + 3y = 2(20) + 3(10) = 50 Rb