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y - wiek córki
x+y=45
x-5=6(x-5)
x=45-y
x-5=6y-30
45-y-5=6y-30
40-y=6y-30
40+30=6y+1y
70=7y
y=10
x+10=45
x=35
b-córka
a+b=45
a-5=6(a-5)
a=45-b
a-5=6a-30
a=45-b
5a=25
a=5
b=45-5
b=40