$k\cdot a\cdot k\cdot a\cdot o=k\cdot a\cdot w\cdot a$

$a^2{k}^{2}o=a^{2}kw\mid :a^2\ne 0\left(\text{czyli}a\ne 0\right)$ $a^2{k}^{2}o=a^{2}kw\mid :a^2\ne 0\left(\text{czyli}a\ne 0\right)$

$k^{2}o=kw\mid :k^2\ne 0\left(\text{czyli}k\ne 0\right)$

$o=\frac{kw}{k^2}$

$o=\frac{w}{k}$