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2x + y = 15
dieliminasi (langsung dikurangi ) menjadi :
5x = - 20
x = -4
disubtitusikan ke y = 3x-5
y = 3x-5
y= 3(-4)-5
y= -12-5
y= -17
nomor 5
x= 5-2y
y-2x=0