x-(12-x)=38 please explain

Answer 1

d+3(d-4)=20 please explain

Answer 2

x-(12-x)=38

x + x - 12 = 38

Add 12 to both sides of the equation.

2x = 50

x = 25

Answer 3

d+3(d-4)=20

d + 3d - 12 = 20

4d = 32

d = ?

Answer 4

on the 1st problem i don't understand how x is being added when the sign is subtraction

Answer 5

Two negatives make a positive.