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f(-8)=-1/4.(-8)-6=2-6=-4
f(5)=-1/4.(5)-6=-5/4-6=-5/4-24/4=-29/4
f(a)=-12 ⇒ -1/4a-6=-12 ⇒ -1/4a=-12+6 ⇒ -1/4a=-6 ⇒ a=4.6 ⇒ a=24
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