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y - syn
x+5 = 4(y+5)
x+5+y +5 = 55
x+5=4y +20
x+y = 20-5
x+4y=15
x+y=45
-x+4y=-15
x + y = 45
--------------+
5y=30
y = 6
x = 45-6 = 39
ojsciec ma 39 lat a sun 6 lat
syn-y
x+5=4(y+5)
x+5+y+5=55
x+5=4y+20
x+4y=15
x+y=45
5y=30
y=6
x=46-6=39
ojciec ma 39lat
syn ma 6 lat