Doprowadz do najprostrzej postaci:
a) 5xy-7x+6y-3xy+5x-xy+
b) (7x do 2 +4x-3) - (-2x do 2 -x +4) +
a) 5xy-7x+6y-3xy+5x-xy= xy-2x+6y
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a) 5xy-7x+6y-3xy+5x-xy= xy-2x+6y