Respect! The meaning of equality in Algebra
Channel: Marie M Francois Pierre-Louis
Date: 13/06/2015

a=5   b=1  c=4  a-b= c    5-1= 4       If I add +b in each side, the equality still verified.   a-b +b = c+ b   5-1 +1= 4+1   5-0=5   5=5