`a)(–15)+14+(–85)` `b) 465+[58+(–465)+(–38)]`
`=[(–85)+(–15)]+14` `=465+[58+(–503)]`
`=(–100)+14` `=465+(–445)`
`=–86` `=20`
`c)160–(6.5^2–3.2^3)+2015^0` `d)2x+5=3^4÷3^2`
`=160–(150–24)+1` `=>2x+5=9`
`=160–126+1` `=>2x=9–5`
`=34+1` `=>2x=4`
`=35` ` =>x=4÷2`
`=>x=2`
`e)x–7=(–14)+(–8)`
`=>x–7=(–22)`
`=>x=(–22)+7`
`=>x=(–15)`