`x xx 6 - 145 = 125`

`x xx 6 = 125 + 145`

`x xx 6 = 270`

`x = 270 : 6`

`x = 45`

`----`

`170 xx ( 12 - 24 : 2 ) + x = 100`

`170 xx ( 12 - 12 ) + x = 100`

`170 xx 0 + x = 100`

`0 + x = 100`

`x = 100 - 0`

`x = 100`

$\color{green }{\text{Wibu}}$ $\color{blue }{\text{Chúa}}$