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-6d-20=-2d+4(1-3d)
We move all terms to the left:
-6d-20-(-2d+4(1-3d))=0
We add all the numbers together, and all the variables
-6d-(-2d+4(-3d+1))-20=0
We calculate terms in parentheses: -(-2d+4(-3d+1)), so:We get rid of parentheses
-2d+4(-3d+1)
We multiply parentheses
-2d-12d+4
We add all the numbers together, and all the variables
-14d+4
Back to the equation:
-(-14d+4)
-6d+14d-4-20=0
We add all the numbers together, and all the variables
8d-24=0
We move all terms containing d to the left, all other terms to the right
8d=24
d=24/8
d=3
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