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30=-10(d+8)
We move all terms to the left:
30-(-10(d+8))=0
We calculate terms in parentheses: -(-10(d+8)), so:We get rid of parentheses
-10(d+8)
We multiply parentheses
-10d-80
Back to the equation:
-(-10d-80)
10d+80+30=0
We add all the numbers together, and all the variables
10d+110=0
We move all terms containing d to the left, all other terms to the right
10d=-110
d=-110/10
d=-11
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