Question

1. 5.5x + 6.9 = 21.2

Explanation:

Step1: Restar 6.9 de ambos lados

$5.5x + 6.9 - 6.9 = 21.2 - 6.9$
$5.5x = 14.3$

Step2: Dividir ambos lados por 5.5

$x = \frac{14.3}{5.5}$
$x = 2.6$

Answer:

$x = 2.6$