4/12xy-11/18xy=1/3xy-11/18xy=6-11/18xy=-5/18xy
(3a-4b)/a+(8a^2+4b^2)/ab=
(3ab-4b^2+8a^2+4b^2)/ab=(3ab+8a^2)/ab=a(3b+8a)/ab=
(3b+8a)/b
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2)(8a2+3ab)/ab = (8a+3b)/b
4/12xy-11/18xy=1/3xy-11/18xy=6-11/18xy=-5/18xy
(3a-4b)/a+(8a^2+4b^2)/ab=
(3ab-4b^2+8a^2+4b^2)/ab=(3ab+8a^2)/ab=a(3b+8a)/ab=
(3b+8a)/b