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3.1d-4.1=-1.8(8d+4)
We move all terms to the left:
3.1d-4.1-(-1.8(8d+4))=0
We calculate terms in parentheses: -(-1.8(8d+4)), so:We get rid of parentheses
-1.8(8d+4)
We multiply parentheses
-14.4d-7.2
Back to the equation:
-(-14.4d-7.2)
3.1d+14.4d+7.2-4.1=0
We add all the numbers together, and all the variables
17.5d+3.1=0
We move all terms containing d to the left, all other terms to the right
17.5d=-3.1
d=-3.1/17.5
d=-2.8181818181818/15.909090909091
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