Odpowiedź:
a)
2x + 8 = x - 5
2x - x = -5 - 8
x = -13
b)
6x + 4 = 2x + 10
6x - 2x = 10 - 4
4x = 6 /:4
x = 6/4 = 1 2/4 = 1 1/2
c)
2x - 2 = x - 8
2x - x = -8 + 2
x = -6
d)
1/6x = 5 /*6
x = 30
e)
x - 4 = -2x + 7
x + 2x = 7 + 4
3x = 11 /:3
x = 11/3 = 3 2/3
f)
2x - 5 = 6x - 1
3z - 6x = -1 + 5
-3x = 4 /:(-3)
x = -4/3 = -1 1/3
g)
4x - 5 = 5 - 4x
4x + 4x = 5 + 5
8x = 10 /:8
x = 10/8 = 1 2/8 = 1 1/4
h)
12 - 2x = x - 8
-2x - x = -8 - 12
-3x = -20 /:(-3)
x = 20/3 = 6 2/6 = 6 1/3
i)
x - 5 = 2x - 2
x - 2x = -2 + 5
-x = 3 /*(-1)
x = -3
Szczegółowe wyjaśnienie:
