Common demominator of (6a-4b)/5-(b+7a)/3-2/1, which of 5,3,and 1 is 15.
(6a-4b)/5-(b+7a)/3-2/1
=3(6a-4b)/5x3-5(b+7a)/3x5-15x2/1x15
=(18a-12b)/15-(5b-35a)/15-30/15
=(18a-12b-5b-35a-30)/15
=(-17a-17b-30)/15
=-17a/15-17b/15-2
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