Question

find the sum of a + b and a - b​

Answer 1

$\rm{(a + b) + (a - b) = a + b + a - b}$

$\longrightarrow\rm{(a + b) + (a - b) = a + a + b - b}$

$\longrightarrow\rm{(a + b) + (a - b) = a + a = 2a}$