Factorise:ar + br + at + bt
By grouping the terms:
$a r+b r+a t+b t=(a r+b r)+(a t+b t)$
$=r(a+b)+t(a+b)$
$=(a+b)(r+t)$
$\therefore a r+b r+a t+b t=(a+b)(r+t)$
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