Question

решите неравенство

8x+12<4-3(4-x)

Answer 1

8x+12<4-3(4-x)

8x+12<4-12+3x
5x<-20
x<-4

 x∈(-бесконечность;-4)

Answer 2

$8x+12<4-3(4-x);\\8x+12<4-12+3x;\\8x+12<-8+3x;\\8x-3x<-8-12;\\5x<-20;\\x<-20:5;\\x<-4;\\(-infty; -4)$