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2.
7x + 20 = 2(x +20)
7x + 20 = 2x + 40
5x = 20
x = 5
Odp.: Ta pani ma 28 lat.
3.
x + 3 = 3(x-3)
x + 3 = 3x - 9
x - 3x = -9 - 3
-2x = -12
x = 6
Odp.: Grześ ma 6 lat.