Factorize each of the following algebraic expressions:

$(2 x-3 y)(a+b)+(3 x-2 y)(a+b)$

$=(2 x-3 y+3 x-2 y)(a+b) \quad[$ Taking $(a+b)$ as the common factor $]$

$=(5 x-5 y)(a+b)$

$=5(x-y)(a+b)$$\quad[$ Taking 5 as the common factor of $(5 x-5 y)]$