Odpowiedź :
a) 3x - 8 - 8x = 12
-5x - 8 = 12
-5x = 12 + 8
-5x = 20 /:(-5)
x = -4
b) -7x + 3 = 24
-7x = 24 - 3
-7x = 21 /:(-7)
x = -3
c) 2x - 2 + 7 = x + 5
2x + 5 = x + 5
2x - x = 5 - 5
x = 0
Odpowiedź:
a)
3*x-(8*x)-8 = 12 / - 12
3*x-(8*x)-12-8 = 0
3*x-8*x-12-8 = 0
-5*x-20 = 0 / + 20
-5*x = 20 / : -5
x = 20/(-5)
x = -4
b)
3-7*x = 24 / - 24
3-7*x-24 = 0
-7*x-21 = 0 / + 21
-7*x = 21 / : -7
x = 21/(-7)
x = -3
c)
2*x-2+7 = x+5 / - x+5
2*x-x-5-2+7 = 0
x = 0