Zadanie
a)
3·x + 8 = 23 l -8
3·x = 15 l :3
x = 5
b)
[tex]\frac{2}{5}\cdot x= 4\ \ \ \ \mid\cdot5\\\\2\cdot x=20\ \ \ \mid:2\\\\x=10[/tex]
c)
1 - 8·x = -10 + 3·x l -1
-8·x = -11 + 3·x l - 3·x
-11·x = -11 l :(-11)
x = 1
d)
-4·x - (-7) + 9·x - 3,5 = 18,5 - 2·x
5·x + 3,5 = 18,5 - 2·x l -3,5
5·x = 15 - 2·x l +2·x
7·x = 15 l :7
[tex]x=\frac{15}{7}\\\\x=2\frac{1}{7}[/tex]
