y(5)=-3*5+4=-15+4=-11
y(-2)=-3*(-2)+4=6+4=10
y(5)+y(-2)=-11+10=-1
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y(5)=-3*5+4=-15+4=-11
y(-2)=-3*(-2)+4=6+4=10
y(5)+y(-2)=-11+10=-1