Get rid of the fraction by multiplying both sides of the equation by the L.C.M of the denominators. The denominator is only n, hence the LCM is n. Multiply both sides of the equation by n. θ=180−
360
n
θ×n=180×n−
360
n
×n θ×n=180×n−360 Group the terms with n at the right side and the number (360) at the left. When it is negative, it becomes positive at the other side and when positive, negative. 360=180×n−θ×n Factorize the n out. 360=n(180−θ) Divide both sides by 180−θ