1. Yx3+Yx8-Yx6+ 10 x Y +720=1260 2. 12x(2xY-4)+(7-3xY)x5+6x(8+10xY)=35708 3. 8x(Y+3)+6x(8-y)+(5xY-2)x7=3684| 4. 8x(2xY+9)+(12-Y)x3+4x(2xY-3-6xY)=18 5.

`Yx3+Yx8-Yx6+10xy+720=1260`

`3Y+8Y-6Y+10Y+720=1260`

`11Y-6Y+10Y+720=1260`

`5Y+10Y+720=1260`

`15Y+720=1260`

`15Y=540`

`Y=540:15`

`Y=36`

`8x(Y+3)+6x(8-y)+(5xY-2)x7=3684`

`8y+24+48-6y+35y-14=3684`

`8y-6y+35y+24+48-14=3684`

`2y+35y+24+48-14=3684`

`37y+24+48-14=3684`

`37y+72-14=3684`

`37y+58=3684`

`37y=3684-58`

`37y=3626`

`y=3626:37`

`y=98`

`2x(4xY-8)- 6x(Y+3)=35712`

`8y-16-6y+18=35712`

`2y-16+18=35712`

`2y-2=35712`

`2y=35712+2`

`2y=35714`

`y=35714:2`

`y=17 857`

$#JAW#$