Question

What must be subtracted from (+10) to make it (+20)

Answer 1

Answer:

-10

Step-by-step explanation:

+10-x= 20

-x= 20-10

-x= 10

divide both sides by -1

x= -10

Check:

10-(-10)=x

10+10= x

x-20

Answer 2

Answer:

30

Step-by-step explanation:

x - (+10) = +20

- x + = -

x - 10 = +20

x = +20 + 10

= 30