Odpowiedź :
Odpowiedź:
a)
7x -4 = 3x - 12
7x - 3x = -12 + 4
4x = -8 /:4
x = -2
b)
3(y + 5) - y = 4(8 + y)
3y + 15 - y = 32 + 4y
2y - 4y = 32 - 15
-2y = 17 /:(-2)
y = -17/2 = -8 1/2
c)
2-4/5x= 3/5
-4/5x = 3/5 - 2 /*(-5/4)
x = 1 2/5 * 5/4 = 7/5 * 5/4 = 7/4 = 1 3/4
d)
x/4 +1 = 5/6 +x/3
1/4x - 1/3x = 5/6 - 1
3/12x - 4/12x = -1/6
-1/12x = -1/6 /*(-12)
x = 1/6 * 12 = 2
e)
5X-7= 23
5x = 23 + 7 /:5
x = 30/5 = 6
Szczegółowe wyjaśnienie: