Odpowiedź:
5x-y- ( -x-3-(-3x-3y)) = 5x-y-( -x-3+ 3x+3y) = 5x-y- ( 2x -3 +3y) = 5x-y-2x +3 -3y = 3x -4y +3
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Odpowiedź:
5x-y- ( -x-3-(-3x-3y)) = 5x-y-( -x-3+ 3x+3y) = 5x-y- ( 2x -3 +3y) = 5x-y-2x +3 -3y = 3x -4y +3