Odpowiedź:
a)
- 5(2x - 7) = 4 - 3(x + 5)
- 10x + 35 = 4 - 3x - 15
- 10x + 3x = - 11 - 35
- 7x = - 46
7x = 46
x = 46/7 = 6 4/7
b)
2(3z - 5) - 3(2 + z) = 5 - (z + 1)
6z - 10 - 6 - 3z = 5 - z - 1
3z - 16 = 4 - z
3z + z = 4 + 16
4z = 20
z = 20/4 = 5
c)
8(1 + 3y) - 3(y - 2) = 2y + 5
8 + 24y - 3y + 6 = 2y + 5
21y + 14 = 2y + 5
21y - 2y = 5 - 14
19y = - 9
y = - 9/19
d)
3(2t + 1) - t = 2t + 2(3 - t)
6t + 3 - t = 2t + 6 - 2t
5t + 3 = 6
5t = 6 - 3
5t = 3
t = 3/5
