Question

Explanation please?!?!

Answer 1

third option

Explanation:

`first\:one:\\\\2x+10=-2x+10 \rightarrow\leftarrow\\\\second:\\\\-2(x+5)=2x-10\\\\-2x-10=2x-10\rightarrow\leftarrow\\\\third:\\\\-2x-10=-2(x+5)\\\\-2x-10=-2x-10 \\\\fourth:\\\\-2(x-5)=-2x-10\\\\-2x+10=-2x-10\rightarrow\leftarrow`

Note: this symbol
`\rightarrow\leftarrow` means contradiction, you can take it as doesn't work

I hope that i explained enough