There are 6 number cards (-4,-2,-1 ,5, 6, 8) arrange the cards into three pairs with the same total

8,-4 : 6,-2 : 5,-1 All should add up to four.

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!