Answer:
a=41/2 or 20.5 or 20 1/2
Explanation:
-8a+6(a+7)=1 (Expand)
-8a+6a+42=1 (Combine like terms)
-2a+42=1
-2a+42-42=1-42 (Subtract 42 from both sides)
-2a=-41
-2a/-2=-41/-2 (Divide both sides by -2)
a=41/2
Hope it helps!
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