Solve for a
a = \frac{40}{3} = 13\frac{1}{3} \approx 13.333333333
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4a-a=40
Multiply both sides of the equation by 8, the least common multiple of 2,8.
3a=40
Combine 4a and -a to get 3a.
a=\frac{40}{3}
Divide both sides by 3.
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