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5x + 3y = 11 x6 ===> 30x + 18y = 66
----------------------- -
17y = 34
y = 2
6x + 7y = 20 ===> 6x + 7 (2) = 20
6x + 14 = 20
6x = 6
x = 1
Jadi x = 1 dan y = 2
semoga jelas dan membantu ya