Solve for x
x=6.63513155874083358
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0.8191520442889918 = \frac{x}{8.1}
Evaluate trigonometric functions in the problem
0.8191520442889918\times 8.1=x
Multiply both sides by 8.1.
6.63513155874083358=x
Multiply 0.8191520442889918 and 8.1 to get 6.63513155874083358.
x=6.63513155874083358
Swap sides so that all variable terms are on the left hand side.
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