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12r=-3-(-9)=-3+9=6
r=1/2
a1+2r=a3
a1+2*1/2=-9
a1=-9-1
a1=-10
an=a1+r(n-1)
an=-10+1/2*(n-1)=-10+1/2 n-1/2
an=0,5n-10,5