Odpowiedź:
A)
9x – 3 = 2x + 5
9x - 2x = 5 + 3
7x = 8 /:7
x = 8/7 = 1 1/7
b)
7x + 8 = x + 20
7x - x = 20 - 8
6x = 12 /:6
x = 2
c)
3( x + 5 ) = 9
3x + 15 = 9
3x = 9 - 15 /:3
x = -6/3 = -2
d)
4 (2x – 3 ) = 0
8x - 12 = 0
8x = 12 /:8
x = 12/8 = 1 4/8 = 1 1/2
e)
4( x -4) = 3x + 1
4x - 16 = 3x + 1
4x - 3x = 1 + 16
x = 17
f)
6(5-2x) = 5(3x + 2)
30 - 12x = 15x + 10
-12x - 15x = 10 - 30
-27x = -20 /:(-27)
x = 20/27
Szczegółowe wyjaśnienie: