The cost of $$3$$ pencils and $$2$$ markers is $$ $13$$. The cost of $$2$$ pencils and $$3$$ markers is $$ $12$$. What is the total cost of $$7$$ pencils and $$7$$ markers? 
Overseas Competition->Knowledge Point->Word Problem Modules->Equation Word Problems->Equivalent Substitution in Equation Word Problems->Replacement of Equivalent Substitution