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3x-wiek matki
2(x+10)=3x+10
2x+20=3x+10
2x-3x=10-20
-x= -10/*(-1)
x=10
3x=3*10=30
odp.syna ma 10 lat a matka 30 lat
3x ->>> wiek matki obecnie -> 3x + 10 MATKI WIEK ZA 10 LAT
x + 10 ->>> wiek syna za 10 lat
2 * (x + 10) ->>> wiek matki za 10 lat
3x + 10 = 2 * (x + 10)
3x + 10 = 2x + 20
3x - 2x = 20 - 10
x = 10
odp. Syn ma 10 lat a matka 30 lat.