a) 2(5a-3)-a-4(3a-2)=0
10a-6-a-12a+8=0
10a-a-12a=-8+6
-3a=-2
a= 2/3
b) 2b-(1-b)=11-b
2b-1+b=11-b
3b+b=11+1
4b=12
b=3
c) 2/5(x-2)=x+4
2/5x-4/5=x+4
2/5x-x=4+4/5
-3/5x=4 i 4/5
x=-8
d) 3y-2(y-1)=-6
3y-2y+2=-6
y=-6-2
y=-8
e) 3(3-5y^2)=90-5(3y^2-2y)
9-15y^2=90-15y^2+10y
-15y^2+15y^2-10y=90-9
-10y=81
y=8 i 1/10
f) 1/4z+(z-6)=2/3(z-2)
1/4z+z-6=2/3z-4/3
5/4z-2/3z=-4/3+6
15/12z-8/12z=4 i 2/3
7/12z=4 i 2/3
z=8
g) 5(2-3x^2)=3(2-5x^2)+x
10-15x^2=6-15x^2+x
-15x^2+15x^2-x=6-10
-x=-4
x=4
h) 0,6(1-x)=0,3(8-x)
0,6-0,6x=2,4-0,3x
-0,6x+0,3x=2,4-0,6
-0,3x=1,8
x=-6
