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i thought u cant add unlike terms

each equation is for different "process"

ya i have no clu w/ this one

do you know how to solve these equations ?

no

ohh ok gimmie a min to figure it out .. sry this ones easy went right over my head

ok. we can keep on solving it if you wish

it would b a correct?

yes, A is the correct answer

thanks!

but, it is really good practice to solve the equations by hand and not substituting answers

but, it's up to you :)