Odpowiedź:
a)
(x+1)/3 = 7 /×3
x + 1 = 21
x = 21-1
x = 20
b)
(3-x)/2 = 1/3 /×6
3(3-x) = 2
9 - 3x = 2
- 3x = 2 - 9
-3x = - 7 /÷3
x = 7/3 = 2 1/3
c)
1 - 3x = 1/2
- 3x = 1/2 - 1
-3x = - 1/2 /÷(-3)
x = 1/6
d)
1/2x + 1 = 4
1/2x = 4 - 1
1/2x = 3 /×2
x = 6
Szczegółowe wyjaśnienie:
