-96=4+10X

-96 = 4 + 10x

Subtract both sides by 4

-96 - 4 = 10x

-100 = 10x

Divide both sides by 10

-100/10 = x

-10 = x

x = -10

$$-{\mathtt{96}} = {\mathtt{4}}{\mathtt{\,\small\textbf+\,}}{\mathtt{10}}{\mathtt{\,\times\,}}{\mathtt{x}}$$

subtract 4 from both side

$$-{\mathtt{100}} = {\mathtt{10}}{\mathtt{\,\times\,}}{\mathtt{x}}$$

divide 10 from both side 

$${\mathtt{x}} = -{\mathtt{10}}$$