Question

Solve for d:
1d+2d=3d-4d

Answer 1

d = 0

Explanation:

1d + 2d = 3d - 4d

d + 2d = 3d - 4d

combine:

d + 2d = 3d

3d - 4d = -d

equals - 3d = -d

add d to both sides

3d + d = -d + d

Simplify :

4d = 0

Divide both sides of the equation by the same term:

4d/4 = 0/4

d = 0/4

so the answer is d = 4

Answer 2

d = 0

Explanation:

1d+2d=3d−4d

Combine 1d and 2d to get 3d.

3d=3d−4d

Combine 3d and −4d to get −d.

3d=−d

-

Add d to both sides.

3d+d=0

Combine 3d and d to get 4d.

4d=0

-

Product of two numbers is equal to 0 if at least one of them is 0. Since 4 is not equal to 0, d must be equal to 0.

d = 0