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x+3y=21
x+3(2x)=21
7x=21
x=3
y=6
x + 3y = 21
x + 3y = 21 → dikali 2
2x - y = 0 dikali 1
2x + 6y = 42
2x - y = 0
———————— -
7y = 42
y = 6
2x - y = 0
2x - 6 = 0
2x = 6
x = 3
Nilai x = 3