(** +3x? - 2x?) (-5x2 + x) = (** +3x* - 2x} }(-5x2)+(x* +3x3 - 2x? )(x) is an example
of:

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!