Odpowiedź:
A)
5x - 7x = 2
-2x = 2 /:(-2)
x = -1
b)
9x - 8x + 2 = 5
x = 5 - 2 = 3
c)
7x + 4 - 8x = 0
-x = -4 /*(-1)
x = 4
d)
42 + 4x - x = 12
3x = 12 - 42 /:3
x = -30/3 = -10
e)
y - 4 + y = 6
2y = 6 + 4 /:2
y = 10/2 = 5
f)
1/2z + 3 - z = -2
-1/2z = -2 - 3 /*(-2)
z = 5 * 2 = 10
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Odpowiedź:
A)
5x - 7x = 2
-2x = 2 /:(-2)
x = -1
b)
9x - 8x + 2 = 5
x = 5 - 2 = 3
c)
7x + 4 - 8x = 0
-x = -4 /*(-1)
x = 4
d)
42 + 4x - x = 12
3x = 12 - 42 /:3
x = -30/3 = -10
e)
y - 4 + y = 6
2y = 6 + 4 /:2
y = 10/2 = 5
f)
1/2z + 3 - z = -2
-1/2z = -2 - 3 /*(-2)
z = 5 * 2 = 10
Szczegółowe wyjaśnienie: