Jawapan:
# x = (1, -2 / 3) #
Penjelasan:
Kami tahu itu
#color (biru) (| x | = (- x, x) #
Jadi kita boleh memecah persamaan menjadi dua
#rarrcolor (oren) (20x = 4x + 16 #
#rarrcolor (ungu) (20x = - (4x + 16) #
Selesaikan kedua-dua persamaan
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#rarrcolor (orange) (20x-4x = 16 #
#rarrcolor (orange) (16x = 16 #
#rarrcolor (hijau) (x = 16/16 = 1 #
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#rarrcolor (ungu) (20x = -4x-16) #
#rarrcolor (ungu) (20x + 4x = -16 #
#rarrcolor (violet) (24x = -16 #
#rarrcolor (hijau) (x = -16 / 24 = -2 / 3 #
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