Danielle spent x dolar on lunch.
Three times as much on transportation, which can be written as 3x
Then,$4 less on a book that she did on transportation, so 3x-4
If she spent $59, we can equal all the expressions to this value.
Therefofore:
x + (3x) +(3x-4) = 59
To find how much she sped on lunch, we need to solve for x:
x + 3x + 3x - 4 = 59
Solve the like terms:
7x -4 = 59
Add both sides 4 units:
7x -4 +4 = 59 + 4
7x = 63
Divide both sides by 7:
7x/7 = 63/7
x = 9
Hence, Danielle spent $9 dollars on lunch.