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3x+4- Jola
x- Paweł
3x+3x+4+x=39
7x=35 |:7
x=5 - wiek Pawła
3x=3*5=15- wiek Gosi
3x+4= 15+4=19- Wiek Joli. :)
J 3x+4 = 19
P x =5
3x +3x+4+x=39
7x+4=39
7x=39-4
7x=35
x=35:7
x=5