In 1926 the very dirt first test asked if a mans salary is 20 dollars a week and he spends 14 dollars a week how long will it take him to save 300 dollars

It is a solve for x equation. It is written as 300=x (20-14) first you do the subtraction in the brackets 300=x (6) then divide both sides by 6 to find x 50=x it would take 50 weeks for him to save 300$ (feel free to check that by putting 50 in for x and solving)

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!