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60 L of gasoline
P 30 for can of oil
P 60 for car wax

60 L+P 30+P 60=P 660
Add like terms
60 L+P 90=P 660
Subtract both sides by P 90
60 L=P 570\
Divide both sides by 60
L=P 9.5

Each liter of gasoline costs P 9.5. Hope this helps =)