Question

Question was provided via image upload.

Explanation:

Step1: Eliminate $4x$ from both sides

Subtract $4x$ from each side:
$4x + 1 - 4x = 1 + 4x - 4x$

Step2: Simplify both sides

Simplify the resulting expression:
$1 = 1$

Answer:

The equation has infinitely many solutions, and the correct step to isolate the variable is "Subtract 4x from each side".