Odpowiedź:
a) x=1 b) x=-2 c)x= 9 i 1/3 d) x=9 e) x=1
Szczegółowe wyjaśnienie:
a) 5(x-7) + 2 = -28
5x - 35 + 2 = -28
5x = 5
x=1
b) 4(3-x) + 9 = 7(2 + x) + 29
12 - 4x + 9 + 14 + 7x + 29
-4x - 7x = 43 - 21
-11x = 22
x=-2
c) 7x -(4x - 8) = 6x - 20
7x - 4x +8 = 6x - 20
-3x = -28
x = 28/3 = 9 i 1/3
d) 5x -3 = 4x + 6
5x - 4x = 6 + 3
x=9
e)4x - 3(3x - 5) = 6x + 4
4x - 9x + 15 = 6x + 4
-5x - 6x = 4 - 15
-11x = -11
x=1
