Answer:
d = 0
Step-by-step explanation:
1d+2d=3d−4d
Combine 1d and 2d to get 3d.
3d=3d−4d
Combine 3d and −4d to get −d.
3d=−d
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Add d to both sides.
3d+d=0
Combine 3d and d to get 4d.
4d=0
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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
