right-hand sides represent same function.

(a) x1'x3 + x1x2x3' + x1'x2 + x1x2' = x2'x3 + x1x3' + x2x3' + x1'x2x3

(b) x1x3' + x2x3 + x2'x3' = (x1 + x2' + x3)(x1 + x2 + x3')(x1' + x2 + x3')

(c) (x1 + x3)(x1' + x2' + x3')(x1' + x2) = (x1 + x2)(x2 + x3)(x1' + x3')

the book that i have is on PDF and shows very little on what to do it just gives the theorems and example problems that have steps where they apply 4 theorems at once and an end result with no work shown. I'm not looking for simply answers (thought I'm guessing there are forum rules against it) but a detailed explanation of it would be wonderful.