1)a + 13 =15
25 – a =23
3a – 5 =(3*а)-5=1
30 : a + 7=22
2)a + 13 =28
25 – a =10
3a – 5 =(3*а)-5=40
30 : a + 7=9
25-15=10
3•2-5=1
1)a + 13 =15
25 – a =23
3a – 5 =(3*а)-5=1
30 : a + 7=22
2)a + 13 =28
25 – a =10
3a – 5 =(3*а)-5=40
30 : a + 7=9