`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`
$#JAW#$