Question

What is x divided by 6.2=-2.1

Answer 1

We have such equation
$\frac{x}{6.2}=-2.1$        /:6.2        (multiply both sides by 6.2)
x=$-2.1*6.2=-13.02$ - its the answer

Answer 2

X/6.2=-2.1
multiply both sides by 6.2
x=-13.02