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a) . 3x+6x-4y-2x+3x+9=10x-4y
b) . -3x-11y+(-6y)-3=-9y-11y-3
-3x-17y-3
b) -3x - 11y+ (-6y)-3 = -3x -11y -6y + 3 = -3x - 17y + 3