self Maths Puzzle

"if a/b=6/5;
find
5a+4b+3/5a-4b+15=?"

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self Other Question

if a/b=6/5;
find
5a+4b+3/5a-4b+15=? if 5+7+4=364730, 9+6+3=456990, and 8+2+9=912672 then 7+3+5=?