Zad 1
5x - 3 = 4x - 4
5x - 4x = 3 - 4
x = -1
Zad 2
a) 4x - 3 = 9
4x = 12 /:4
x = 3
b) 3x - 5 = x + 8
2x = 13 /:2
x = 6,5
c) 3(x + 3) = 2x - 1
3x + 9 = 2x - 1
x = -10
Zad 3
a) x + 41 = (2x + 13) - (x - 28)
x + 41 = 2x + 13 - x + 28
x + 41 = x + 41
0 = 0
Tożsamościowe
b) 6x - x + (2x + 3) = 3(2 - x)
7x + 3 = 6 - 3x
10x = 3 /:10
x = 0,3
c) x/3 - x/6 = 4 + x/2 /•6
2x - x = 24 + 3x
-2x = 24 /:(-2)
x = -12
d) 2x + 15 = 16(1 + 0,125x)
2x + 15 = 16 + 2x
0 = 1
sprzeczne
