Oh, dude, that's a fancy one! So, the grammatical name given to the expression "Knowing the approach" is a gerund phrase. It's like a verb form ending in -ing that functions as a noun. So, next time you want to sound all scholarly, just drop "gerund phrase" into the conversation and watch everyone nod like they know what you're talking about.
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This is not an equation since there is no equals sign. This means it is an expression, which can't be solved, only simplified. Even if it were an equation, there are two variables in this expression, so without knowing the values for both variables, we would not know if 67 is a solution.
The sum of the given expression would depend on the values of the variables which have not been given.
A variable
Mumu
The given expression in algebra can be simplified to 12b