Odpowiedź:
a) 4x = 20 |:4
x = 5
b) 2/3x = 9 |:2/3
x = 27/2
c) -3x = 8 |: (-3)
x = -8/3
d) 3x + 4 = 13 |-4
3x = 9 |:3
x = 3
e) 5x - 4 = 6 |+4
5x = 10 |:5
x = 2
f) 3*(x + 5) = 12
3x + 15 = 12 |-15
3x = -3 |:3
x = -1
g) 4*(x - 1) = 16
4x - 4 = 16 |+4
4x = 20 |:4
x = 5
h) 3x + 4 = 2x + 7
3x - 2x = 7 - 4
x = 3
i) 5x - 2 = 3x + 4
5x - 3x = 4 - 2
2x = 2 |:2
x = 1
j) 2(x + 1) + 3(x + 2) = 4
2x + 2 + 3x + 6 = 4
5x + 8 = 4 |-8
5x = -4
x = -4/5
Mam nadzieję, że pomogłam :-)
