Odpowiedź:
a) 4 • x + 7 = 2 • x + 13 | -2 • x
4 • x - 2 • x + 7 = 13 | - 7
4 • x - 2 • x = 13 - 7
2 • x = 6 /: 2
x = 3 K
L = 4 • x + 7 = 4 • 3 + 7 = 11 + 7 = 19
P = 2 • x + 13 = 2 • 3 + 13 = 6 + 13 = 19
L = P
b) 7 • x + 4 = 4 • x + 4 | -4 • x
7 • x - 4 • x + 4 = 4 | -4
7 • x - 4 • x = 4 - 4
3 • x = 0
x = 0 Ń
L = 7 • x + 4 = 7 • 0 + + 4 = 0 + 4 = 4
P = 4 • x + 4 = 4 • 0 + 4 = 0 + 4 = 4
L = P
c) -2 • x + 7 = -6 • x - 5 | +6 • x
-2 • x + 6 • x + 7 = -5 | -7
-2 • x + 6 • x = -5 - 7
4 • x = -12 /: 4
x = -3 M
L = - 2 • x + 7 = -2 • (-3) + 7 = 6 + 7 = 13
P = -6 • x - 5 = -6 • -3 - 5 = 18 - 5 = 13
L = P
d) 3 • x + 6 = -3 • x - 6 | +3 • x
3 • x + 3 • x + 6 = -6 | -6
3 • x + 3 • x = -6 - 6
6 • x = -12 /: 6
x = -2 I
L = 3 • x + 6 = 3 • (-2) + 6 = -6 + 6 = 0
P = -3 • x - 6 = -3 • (-2) - 6 = 6 - 6 = 0
L = P
e) -7 • x + 8 = 2 - 4 • x | +4 • x
-7 • x + 4 • x + 8 = 2 | -8
-7 • x + 4 • x = 2 - 8
-3 • x = -6 /: (-3)
x = 2 S
L = -7 • x + 8 = -7 • 2 + 8 = -14 + 8 = -6
P = 2 - 4 • x = 2 - 4 • 2 = 2 - 8 = -6
L = P
x : -3 -2 0 2 3
Litera : M I Ń S K
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