a)2/3*x-1/5>7/15
2x/3-1/5>7/15
amplificam corespunzator si =>(10x-3)/15>7/15
<=>10x-3>7
10x>10
b)1,3*x-13<2x+8
13x/10-130/10<(20x+80)/10
13x-130<20x+80
13x<20x+110
c)(-2x+1)/5>=(-5*x+1)/2
-4x+2>=-25x+5
-3>=21x
-7x<=-1
7x>=1
d)(4*(x+3))/-3<=(2x-2)/9
-12x-36<=2x+2
-14x-36<=2
14x>=-34
