243/10:(-174/10)-214/10=243/10×(-10/175)-214/10=243/175-214/10=243/175-107/5=243-3745/175=-3502/175=-20 целых 2/175
3(x-5)>7x
3x-15>7x
3x-7x>15
-4x>15|:(-4)
x<-3.75
Ответ:(-∞;-3,75)
(x -4)/(3 -x) =1
x -4 =1*(3 -x)
x -4 -3 +x =0
2x -7 =0
2x =7
x =7/2
x =3.5