Odpowiedź:
4a=-8
a = -8/4
a = -2
1/3x=20
x = 20/ 1/3
x = 20 * 3/1
x = 60
5a+5=10
5a = 10 - 5
5a = 5
a = 1
4a+6=a
4a -a = 6
3a = 6
a = 6/3
a = 2
