Respuesta :

wegnerkolmp2741o

Answer:

x = 80

Step-by-step explanation:

Let x be the unknown number

1/2 x - 10 = 30

Add 10 to each side

1/2x -10+10 = 30+10

1/2x = 40

Multiply each side by 2

1/2x * 2 = 40*2

x = 80