умножить и числитель и знаменатель 2x+1
x+3
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2x-1
(x+3)(2x+1) 2x^2+x+6x+3 2x^2+7x+3
------------------ =-----------------------=--------------------
(2x-1)(2x+1) 4x^2-1 4x^2-1
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(x+3)(2x+1) 2x^2+x+6x+3 2x^2+7x+3
------------------ =-----------------------=--------------------
(2x-1)(2x+1) 4x^2-1 4x^2-1