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-4+3(d+2)=4d
We move all terms to the left:
-4+3(d+2)-(4d)=0
We add all the numbers together, and all the variables
-4d+3(d+2)-4=0
We multiply parentheses
-4d+3d+6-4=0
We add all the numbers together, and all the variables
-1d+2=0
We move all terms containing d to the left, all other terms to the right
-d=-2
d=-2/-1
d=+2
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