Odpowiedź:
zad 1
x = 2
x = 4
x = 60
x = 5
zad 2
a) x + 12 = 13
x = 13 - 12
x = 1
b) 6 + x = 2
6 - 2 = -x
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
x = 7
f) 1/3x = 12
x = 36
zad 3
a) -2 = x + 5
-x = -5 + 2
x = 3
b) 2[tex]\frac{3}{8}[/tex] = x + [tex]\frac{1}{8}[/tex]
-x = -1/8 - 2 3/8
x = -2[tex]\frac{1}{4}[/tex]
c) 5,3 = x - 1,4
5,3 + 1,4 = x
x = 6,7
d) 15 = -3x
3x = -15
x = -5
zad 4
a)5x + 4 = 10
5x = 10 - 4
5x = 6
x = 0,8(3)
b) 3x - 5 = 9
3x = 9 + 5
3x = 14
x = 4,(6)
c) -2x + 3 = 7
-2x = 7 - 3
-2x = 4
x = -2
d) -4x - 3 = 13
-4x = 13 + 3
-4x = 16
x = -4
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