Solve for a
a=65
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3+12a-12=771
Use the distributive property to multiply a-1 by 12.
-9+12a=771
Subtract 12 from 3 to get -9.
12a=771+9
Add 9 to both sides.
12a=780
Add 771 and 9 to get 780.
a=\frac{780}{12}
Divide both sides by 12.
a=65
Divide 780 by 12 to get 65.
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