Solve for a
a=40
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3a-72-a=8
Subtract a from both sides.
2a-72=8
Combine 3a and -a to get 2a.
2a=8+72
Add 72 to both sides.
2a=80
Add 8 and 72 to get 80.
a=\frac{80}{2}
Divide both sides by 2.
a=40
Divide 80 by 2 to get 40.
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