Odpowiedź :
A
b) 8*x - 5 - 4 * x = 15
8x - 5 -4x = 15
4x = 15 + 5
x = 5
c) x - 9 + 7 *x = 55
x - 9 + 7x = 55
8x = 55+ 9
8x = 64
x = 8
B
a) 5 * x = 3 * x - 6
5x = 3x - 6
5x - 3x = -6
2x = -6
x = -3
b) 8 * x = 14 + x
8x = 14 + x
8x - x = 14
7x = 14
x = 2
i)5 * x = 3 * x - 12
5x = 3x - 12
5x - 3x = -12
2x = -12
x = - 6
C
c) 11 * x - 9 = 7 * x - 5
11 x - 9 = 7x - 5
11x - 7x = -5 + 9
4x = 4
x = 4
d) 5*x + 7 = 6 * x + 12
5x + 7 = 6x + 12
5x - 6x = 12 - 7
-x = 5
x = - 5