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7x+20=2(x+20)
7x+20=2x+40
7x-2x=40-20
5x=20/:5
x=4
4*7=28
Odp: Pani ma 28 lat
7x - wiek tej pani teraz
7x + 20 = 2(x+20)
7x + 20 = 2x + 40
7x - 2x = 40 - 20
5x = 20/:5
x = 4
7 * 4 = 28
Odp: Pani ma 28 lat.
Proszę o naj!!