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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:Ta pani ma 28 lat.
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