The eq'n of a str. line in std. form looks like Ax + By = C or Ax + By + D = 0.
Start by determining the LCD of 3/4x - 5/2; it is 4.
Multiply both terms on the right by 4. This results in 4y = 3x - 10.
This last result can be re-written as 3x - 4y - 10 = 0 (the equation in std. form)