Odpowiedź:
d) -2x = 7x + 18
-9x = 18/ -9
x = -2
b) 3x - 4 = 5x
3x - 5x = 4
-2x = 4/ -2
x = -2
e)
-4x + 5 = 25 - 9x
-4x + 9x = 25 - 5
5x = 20/ 5
x = 4
a)
6x + 4 = 2x
6x - 2x = -4
4x = -4 /-4
x = -1
c)
-2x + 7 = 6x - 9
-2x - 6x = -9 - 7
-8x = - 16 /-8
x = 2
Szczegółowe wyjaśnienie: