Combine like terms using properties of equality if nessesary (subtaction property) X-1/2x=1kg+1/2x-1/2x

Simplify (Substatution property) 1/2x=1kg

Isolate variable 2*1/2x=1kg*2

SImplify x=2kg

Answer the question The brick weighs 2 kg

the weight has already been found so there is no need for any other formulas to solve the equation like the newtons thing and KG is a valid form of weight mesurment. That arguement is for another thread though

**Edited by Nabtalkin, 14 February 2008 - 03:58 AM.**