Which fractions are equivalent? 20/5 -20/5 20/-5 -20/-5 120/5

20/5 is equivalent to 4 , -
-20/5 is equivalent to -4
20/-5 is equivalent to -4
-20/-5 is equivalent to 4
120/5 is equivalent to 24

Therefore 20/5 & -20/-5 are equivalent and -20/5 & 20/-5 are equivalent 

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!