A variable comes after the number 2n+5n=7n
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Independent variable
you first look at the varaibles and their power if there is more than one variable then you will have how ever many variables there are that's how many separate answers there will be also, if you have a number to the power or 2 then there will be two answers for that ONE variable... if you have a number to the power of 8 then you will have eight answers for the one variable.
This equation is linear, because neither variable symbol occurs to any power except the first.
yes
first it takes you through whole lot dumb stuff and you take it up there