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4x +3y = 23 x(5)
<=>20x -28y = -100
20x +15y=115
<=> -43y = -215
<=> y = -215/-43 = 5
4x +3y = 23
4x +3(5)= 23
4x = 23-15 = 8
x =8/4 = 2
-3x +6y = -3(2) + 6(5)= -6 + 30 = 24
jadi jawabannya C