X - 3/ 4 = 12

(it's x - 3 over 4 and i'm lost at what to do.)

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test