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{3·4+ (-3)=9
{4-2·(-3)=10
{12-3=9
{4+6=10
9=9
10=10
SPEŁNIA
b)
{2·4+3·(-3)=-1
{4-2·(-3)=8
{8-9=-1
{4+6=8
{-1=-1
{10≠8
NIE SPEŁNIA