Zad. 1
x + 4 = 6
x = 6 - 4
x = 2
2x = 8|: 2
x = 4
x - 10 = 50
x = 50 + 10
x = 60
Zad. 2
a) x + 12 = 13
x = 13 - 12
x = 1
b) 6 + x = 2
x = 2 - 6
x = - 4
c) x - 7 = 9
x = 9 + 7
x = 16
d) 3,7 + x = 2
x = 2 - 3,7
x = - 1,7
e) 2x = 14|: 2
x = 7
f) [tex]\frac{1}{3}[/tex]x = 12|* 3
x = 36
g) [tex]\frac{x}{3}[/tex] = 9|* 3
x = 27
h) [tex]\frac{x}{2}[/tex] = 9|* 2
x = 18
Zad. 6
a) [tex]\frac{x}{5}[/tex] + 8 = 20
[tex]\frac{x}{5}[/tex] = 20 - 8
[tex]\frac{x}{5}[/tex] = 12|* 5
x = 60
b) 3 + [tex]\frac{x}{3}[/tex] = 4
[tex]\frac{x}{3}[/tex] = 4 - 3
[tex]\frac{x}{3}[/tex] = 1|* 3
x = 3
Zad. 7
a) 3(x-5) = 9
3x - 15 = 9
3x = 9 + 15
3x = 24|: 3
x = 8
b) 4(x+1) = -8
4x - 4 = -8
4x = -8 - 4
4x = -12|: 4
x = -3
