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y-monety 5 zł
{x+y=35/*2
{2x+5y=112
{2x+2y=70
{2x+5y=112
7y=182/:7
y=26
x+y=35
x+26=35
x=35-26
x=9
Odp:W skarbonce jest 26 monet 5 zł i 9 monet 2zł.