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x – 7=…………………………………………… dla x= 31
x – 5 =……………………………………………dla x=3
a +(-3) =…………………………………………….dla a=(-5)
2x+7 = ………………………………………………dla x=5
4 + 3a =………………………………………………dla a= 2
2y – 5=………………………………………………dla y=-3

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