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15x = 10y = 6z
3x+5y-2z = 33, subtitusi z=15x/6; dan y= 15x/10
3x+5(15x/10)-2(15x/6) = 33
3x+7,5x-5x = 33
5,5x = 33
x = 6; maka y = 9; dan z = 15....opsi C