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-82=10(d+2)-12
We move all terms to the left:
-82-(10(d+2)-12)=0
We calculate terms in parentheses: -(10(d+2)-12), so:We get rid of parentheses
10(d+2)-12
We multiply parentheses
10d+20-12
We add all the numbers together, and all the variables
10d+8
Back to the equation:
-(10d+8)
-10d-8-82=0
We add all the numbers together, and all the variables
-10d-90=0
We move all terms containing d to the left, all other terms to the right
-10d=90
d=90/-10
d=-9
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