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y-ojciec
y+5=4x+5
y+5+x5=55
y=4x
y+x=45
y=4x
4x+x=45
y=4x
x=9
y=36
x=9
Ojciec ma 36 lat, a syn 9.
4(x+5)-ojciec
4(x+5)=55
4x+20+x=55
4x+x=55-20
5x=35
x=7
x-5=7-5=2 syn obecnie
4(x+5)=4*7+4*5=28+20=48-5=43 ojciec obecnie