21-3d=12

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Solution for 21-3d=12 equation:



21-3d=12
We move all terms to the left:
21-3d-(12)=0
We add all the numbers together, and all the variables
-3d+9=0
We move all terms containing d to the left, all other terms to the right
-3d=-9
d=-9/-3
d=+3

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