How to isolate a variable (physics 3rd year)

In this video I explain the clearing of variables, for this I bring you four formulas and in each of them you will have to clear a variable that is indicated in parentheses. The goal of clearing a variable is to leave it absolutely alone on one member of the equality, be it the first member or the second member.
00:00 Intro
00:32 Formula 1 clearance
03:59 Formula 2 clearance
06:47 Formula 3 clearance
09:05 Formula 4 clearance

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EXCELENTE EXPLICACIÓN!