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2x+y=7
______ -
x = 5
2x+y =7
10+y =7
y = 7 -10
= -3
x+y = 5 +(-3) = 2
jawab c. 2
2x + y = 7
ketika dikurang, x = 5
mencari y,
2x + y = 7
10 + y = 7
y = -3
Hasil x + y = 5 - 3 = 2 ( C. )