Solve for k_4
k_{4}=\frac{\sin(2x)}{x}
x\neq 0
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\sin(2x)=k_{4}x
Multiply both sides of the equation by x.
k_{4}x=\sin(2x)
Swap sides so that all variable terms are on the left hand side.
xk_{4}=\sin(2x)
The equation is in standard form.
\frac{xk_{4}}{x}=\frac{\sin(2x)}{x}
Divide both sides by x.
k_{4}=\frac{\sin(2x)}{x}
Dividing by x undoes the multiplication by x.
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