`@` `\text {Ans}`
`\downarrow`
`35-815-(795-65)`
`= 35-815-795+65`
`= (35+65)+(-815-795)`
`= 100-1610`
`= -1510`
\(=35-815-795+65\\ =\left(35+65\right)-\left(815+795\right)\\ =100-1610\\ =-1510\)
= 35 - 815 - 795 + 65
= -780 - 795 + 65
= -1575 + 65
= -1510