Odpowiedź:
a) 5*x-3 +2*x= 4*x+9
5x -3 +2x =4x +9
5x +2x -4x = 9 +3
3x= 12 /:3
x= 4
spr.. 5*4 -3 +2*4= 4*4+9
20 -3 +8= 16+9
25=25
L=p
b) 8*x -6-9*x= 5*x -6
8x -9x -5x= -6 +6
8x-14x= 0
-6x= 0
x=0
spr.. 8*0 -6 -9*0= 5*0-6
-6= - 6
L=p
c) 2+4*x -1 +2*x = - 8 +4*x -7
2+4x -1 +2x = - 8 +4x -7
4x+2x- 4x= -7 -8 +1-2
2x = -16 /:2
x= - 8
spr... 2 + 4*(-8) -1 +2*(-8) = -8 + 4*(-8)-7
2 -32 -1 -16= -8 -32 -7
-47= -47
L=P
d) -3 +7*x -2= 3*x -11 +6*x
-3 +7x -2 = 3x -11 +6x
7x- 3x -6x= -11 +2 +3
-2x= -6 /:2
x= 3
spr... -3 +7*3 -2= 3*3 -11 +6*3
-3 +21 -2= 9-11 +18
16= 16
L=P
e) 4+5*x -2= 7*x-7
4 +5x -2= 7x-7
5x-7x= - 7 -4 +2
-2x = -9 /: 2
x= 9/2= 4 i 1/2
spr... 4 + 5*9/2 -2= 7*9/2 -7
4 + 45/2-2= 63/2 -7
4 + 22 i 1/2 -2= 31 i 1/2-7
24 i 1/2= 24 i 1/2
L=P
f) -8 +7*x +3 = 5*x +4 +4*x +5
-8 + 7x +3= 5x +4 +4x +5
7x -5x -4x= 4+5+8 -3
-2x= 14 /:2
x= -7
spr... -8 + 7* (-7) +3= 5*(-7) +4 + 4 *(-7)+5
-8 - 49 +3= -35+4 +5 -28
-54= 54
L=P
Szczegółowe wyjaśnienie:
