Question

1. 0.4x + 9 = 11

Explanation:

Step1: Subtract 9 from both sides

$0.4x + 9 - 9 = 11 - 9$
Simplify to get $0.4x = 2$

Step2: Divide both sides by 0.4

$\frac{0.4x}{0.4} = \frac{2}{0.4}$
Simplify to find $x = 5$

Answer:

$x = 5$