Х(8-3х)+11<3(7- х)(х+7)+8
8x-3x^2+11<(21-3x)*(x+7)+8<br>8x-3x^2+11<21x-3x^2+147-21x+8<br>8x-3x^2+11<-3x^2+155<br>8x-3x^2+3x^2<155-11<br>8x<144<br>x<18