Uprość wyrażenia algebraiczne :
a) x-3y-2x+6y
b) 2y-5-3y-4-8y+9
a) x-3y-2x+6y=3y-x
b) 2y-5-3y-4-8y+9=-9y
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a) x-3y-2x+6y=3y-x
b) 2y-5-3y-4-8y+9=-9y