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2(4d+1)-9d=6(2-d)
We move all terms to the left:
2(4d+1)-9d-(6(2-d))=0
We add all the numbers together, and all the variables
2(4d+1)-9d-(6(-1d+2))=0
We add all the numbers together, and all the variables
-9d+2(4d+1)-(6(-1d+2))=0
We multiply parentheses
-9d+8d-(6(-1d+2))+2=0
We calculate terms in parentheses: -(6(-1d+2)), so:We add all the numbers together, and all the variables
6(-1d+2)
We multiply parentheses
-6d+12
Back to the equation:
-(-6d+12)
-1d-(-6d+12)+2=0
We get rid of parentheses
-1d+6d-12+2=0
We add all the numbers together, and all the variables
5d-10=0
We move all terms containing d to the left, all other terms to the right
5d=10
d=10/5
d=2
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