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a-1=3b
a=3b+1
b/3b+1=a
b= (3b+1)(3b+1)
b=9b(do kwadratu) + 3b + 1
b) 3 * a-1/b +2 * - b/a-1
3a-1/b + 2(-b/a-1) * 3
3a-1/b + 6(-b/a-1)
(3a-1/b + 6(-b/a-1))/a-1/b
2a+6(-b/a-1)