Реши уравнения 79-x=46-9 , 45+y=100 -15, 13 - a=21-12, 12 + c=90-70

Question

Реши уравнения 79-x=46-9 , 45+y=100 -15, 13 - a=21-12, 12 + c=90-70

Answer 1

1)
79-x=46-9
79-x=37
x = 37-79
x = -42

2)
45+y=100-15
45+y=85
y=85-45
y=40

3)
13-a=21-12
13-a=9
a=9-13
a=-4

4)
12+c=90-70
12+c=20
c=20-12
c=8

Answer 2

79-x=46-9
x=46-9=37
x=79-37=42
x=42

45+y=100
y=100-45=55
y=55

13-a=21-12
a=21-12=9
a=13-9=4
a=4

12+c=90-70
c=90-70=20
с=20-12=8
с=8