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