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-2x - 3y - 6 + 5x - 7y + 5
= -3x - 10y - 1
maka pengurangannya menjadi =
(-2x-3y-6) - (-5x+7y-5).
= -2x + 5x.
= -3y - 7y.
= -6 + 5.
jadi hasilnya adalah = 3x - 10y - 1.