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Solve A = bh for b. Since h is multiplied times b, you must divide both sides by h in order to isolate b. Since (c+d) is divided by 2, you must first multiply both sides of the equation by 2.
A literal equation is an equation where any variable that you have, they all represent known values. Literal equations are used to solve time, distance, interest, and slope ,(all having to be variables in the equation). Go on purple math to figure how to do literal equations.