a)3x-1≤8
3x≤8+1
3x≤9
x ≤ [tex] \frac{9}{3} [/tex]
x≤3
b)x+12>2x+3
12>2x+3-x
12>x+3
12-3>x
9>x
x<9
c)4•(2x+1)=2x+3
8x+4=2x+3
8x+4-2x=3
6x+4=3
6x=3-4=-1
[tex]x = - \frac{1}{6} [/tex]
d)2•(x-1)<x+1
2x-2<x+1
2x<x+1+2
2x<x+3
2x-x<3
x<3
e)3-2x>1-x
3>1-x+2x
3>1+x
3-1>x
2>x
x<2
