When I make a value (eg k) the subject of the an equation, can i have that subject (e.g. K) on the right hand side as well? or only left?
Only the left. Taking your example, presuming that is: 13a = 6a / (15b) - 7b We want to solve for a. The first step is to get rid of the denominator by multiplying both sides by that expression. After that we get: 13a(15b) = 6a - 7b(15b) 195ab = 6a - 105b² Now move all terms with "a" to the left side and all other terms to the right: 195ab - 6a = 105b² Factor the "a": a(195b - 6) = 105b² Now divide both sides by the factor: a = 105b² / (195b - 6) I notice that all terms in the right side have 3 as a common factor, so we can factor out the 3's and cancel: a = 3 * 35b² / [3(65b - 2)] a = 35b² / (65b - 2) That's your equation solved for a in terms of b.
No, your k must be by himself on the left and no k on the right.
13a =6a/15b-7b my problem is getting rid of the a on the ring hand side.