Final answer:
The equation 20x + 5y = -13 cannot be simplified to an equivalent equation with integer coefficients for both x and y without more information. One variable must be given an integer value to solve for the other.
Step-by-step explanation:
The equation 20x + 5y = -13 can be solved for either variable, x or y, in terms of integers. However, as it stands, this linear equation cannot be simplified into an equivalent statement with integer coefficients for both variables without additional information. To solve for one variable using integers, you would need to set one variable to a specific integer value to find the corresponding value of the other variable. For example, if x were set to 1, the equation would be solvable for y using basic algebraic manipulation.