Apply the distributive property to . Apply the distributive property to . Collect like terms in the LHS. Add the additive inverse of the constant term in the LHS to both sides. Multiply both sides by the reciprocal of the coefficient on the variable. Substitute the value you derived for the variable back into the original equation and do the arithmetic to check your work.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it