Question

x + 30 = 280
15+ =97
10x + 130=270
-20+5x=65
x3 +12=42​

Answer 1

x + 30 = 280

x = 280 - 30

x = 250

------------------------------------

15 + x = 97

x = 97 - 15

x = 82

------------------------------------

10x + 130 = 270

10x = 270 - 130

10x = 140

x = 140/10

x = 14

------------------------------------

-20 + 5x = 65

5x = 65 + 20

5x = 85

x = 85/5

x = 17

------------------------------------

x3 + 12 = 42

x · 3 + 12 = 42

3x + 12 = 42

3x = 42 - 12

3x = 30

x = 30/3

x = 10