a)
2(x+2)-3(x-1)+8=3x-1
2x+4-3x+3+8-3x=-1
-4x+15=-1
-4x=-1-15
-4x=-16/:(-4)
x=4
spr:
2(4+2)-3(4-1)+8=34-1
26-3*3+8=12-1
12-9+8=11
11=11
b)
4x-3(x+7)-5x+2(x-1)=9
4x-3x-21-5x+2x-2=9
-2x-23=9
-2x=9+23
-2x=32/:(-2)
x=-16
spr:
4*(-16)-3(-16+7)-5*(-16)+2(-16-1)=9
-64+27+80-34=9
107-98=9
9=9
c)
(x+2)^2-2x+32=(x-4)^2
x^2+4x+4-2x+32=x^2-8x+16
x^2+2x-x^2+8x+36=16
10x=16-36
10x=-20/:10
x=-2
spr:
(x+2)^2-2x+32=(x-4)^2
(-2+2)^2-2*(-2)+32=(-2-4)^2
0+4+32=(-6)^2
36=36