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To solve the equation 25x + 4 = 15, we need to isolate the variable "x" by getting rid of the constant term of 4 and the coefficient of 25.
First, subtract 4 from both sides of the equation:
25x + 4 - 4 = 15 - 4
25x = 11
Next, divide both sides of the equation by 25 to solve for x:
25x/25 = 11/25
x = 11/25
Therefore, the solution of the equation 25x + 4 = 15 is 11/25.