[tex]\frac{x}{y} = \frac{x+12}{0,8*y} \\\\2*\frac{x}{y} = \frac{x+12}{0,8*y} \\\\\frac{2x}{y} = \frac{(x+12)*10}{8*y} \\\\y*(x+12)*10=2x*8y\\\\10yx+10y12=16xy\\\\120y=16xy-10xy\\\\120[y]=6x[y]\\\\6x=120\\\\x=120\\\\\frac{20}{y}\\\\np.\frac{20}{1} = \frac{20+12}{1*0,8} =\frac{32}{0,8} =\frac{40}{1} \\\\\\\\\\\\\\\\\\[/tex]
* = mnożenie
mam nadzieję że pomogłam choć trochę.
x = 20
y = 1
