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(a+5b)/15=14/10=7/5=21/15
a+5b=21
1+5*4=21
a=1, b=4
1/15+4/3=1,4
1/a+b/6=7/10
1/a+5b/30=21/30
1+5b=21
b=4
1/a+4/6=21/30
1/a+20/30=21/30
a=30
a/b+c/d=13/10
(ad+bc)/(bd)=13/10
bd=10
ad+bc=13
Niech b=2, d=5
5a+2c=13
5*1+2*4=13
a=1, c=4
1/2+4/5=13/10
a=1, b=2, c=4, d=5