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a/5=20+b/3
a/5-b/3=20
3a-5b=20*15
3a-5b=300
a=120+b
3(120+b)-5b=300
360+3b-5b=300
2b=60
b=30
a=120+30
b=150
p%*150=30
p%=30/150
p%=0,2
p=20%