These are called literal equations since you are solving for a single variable with respect to other variables and constants. You solve these in the same manner as you would solve an equation in one variable. Isolate the variable in question and display the results in terms of the other variables and constants.

Solve form

First, subtractbfrom both sides

Second, divide both sides byxthus isolating the variablem

Use the Symmetric Property of Equality to get:

Use similar techniques to solve forbandx

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Solve forr

First, divide both sides by

Second, take the square root of both sides

Symmetric Property yields:

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Try the next 3 and see how you do. I'm not sure about your notation for number 5. Could you use some grouping symbols () to clarify. Thanks.