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4a-7-a=5
Subtract a from both sides.
3a-7=5
Combine 4a and -a to get 3a.
3a=5+7
Add 7 to both sides.
3a=12
Add 5 and 7 to get 12.
a=\frac{12}{3}
Divide both sides by 3.
a=4
Divide 12 by 3 to get 4.