Solve for a
a = \frac{40}{3} = 13\frac{1}{3} \approx 13.333333333
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27=3a-\left(4\times 3+1\right)
Multiply both sides of the equation by 3.
27=3a-\left(12+1\right)
Multiply 4 and 3 to get 12.
27=3a-13
Add 12 and 1 to get 13.
3a-13=27
Swap sides so that all variable terms are on the left hand side.
3a=27+13
Add 13 to both sides.
3a=40
Add 27 and 13 to get 40.
a=\frac{40}{3}
Divide both sides by 3.
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