Odpowiedź:
1.
x+7=21
X=21-7
X=14
x-6=19
X=19+6
X=25
x-2=-9
X=-9+2
X=-7
-x+2=-3
-x=-3-2
-x=-5
X=5
5-x=3
-x=3-5
-x=-2
X=2
8-x=12
-x=12-8
-x=4
X=-4
-3-x=9
-x=9+3
-x=12
X=-12
4-x=-7
-x=-7-4
-x=-11
X=11
-7+x=2
X=2+7
X=9
12+x=-5
X=-5-12
X=-17
Zad.2
2x=18
X=18:2
X=9
3x=5
X=5:3
X=1 2/3
-2x=16
X=16:(-2)
X=-8
5x=-20
X=-20:5
X=-4
-4x=-24
X=-24:(-4)
X=6
Odpowiedź:
Zad.1
x+7 = 21
21 - 7 = x
x = 14
x - 6 = 19
19+6 = x
25 = x
x-2= -9
x = 11
-x + 2 = -3
x = 5
5-x=3
x = 2
8-x=12
x = -4
-3-x=9
x = -12
4-x = -7
x = 11
-7+x = 2
x = 9
12+x= -5
x= -17
Zad.2
2x = 18
18 : 2 =x
x = 9
3x = 5
x = 2
-2x = 16
x = (-8)
5x = -20
x = (-4)
-4x = -24
x = 6
