Step 1: Isolate the constant term on the left side of the inequality by adding 4.2x to subtracting 4.2x from multiplying by 4.2x on dividing by by 4.2x on  both sides of the inequality.

Step 2: Isolate the variable term on the right side of the inequality by adding 7.2 to subtracting 7.2 from multiplying by 7.2 on dividing by 7.2 on  both sides of the inequality.

Step 3: Create a variable coefficient of 1 by adding −12.5 to subtracting −12.5 from multiplying by −12.5 on dividing by −12.5 on  both sides of the inequality.

Step 4: The solution set is x = 0.128 x < 0.128 x > 0.128 .