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[(a+b)²/(a-b)²] * (2a-2b)/(3a+3b) - a²/(a²-b²)*b/a
=(a+b)^2/(a-b)^2*2(a-b)/[3(a+b)]-a^2/(a+b)(a-b)*b/a
=2(a+b)/3(a-b)-ab/(a+b)(a-b)
=[2(a+b)^2-3ab]/[3(a-b)(a+b)]
=(2a^2+2b^2+ab)/[3(a-b)(a+b)]
=(a+b)^2/(a-b)^2*2(a-b)/[3(a+b)]-a^2/(a+b)(a-b)*b/a
=2(a+b)/3(a-b)-ab/(a+b)(a-b)
=[2(a+b)^2-3ab]/[3(a-b)(a+b)]
=(2a^2+2b^2+ab)/[3(a-b)(a+b)]
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