(D+3)(x-4)=0

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Solution for (D+3)(x-4)=0 equation: 



(+3)(D-4)=0

We add all the numbers together, and all the variables

3(D-4)=0

We multiply parentheses

3D-12=0

We move all terms containing D to the left, all other terms to the right

3D=12

D=12/3

D=4

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