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65=2.5(d+-5)
We move all terms to the left:
65-(2.5(d+-5))=0
We add all the numbers together, and all the variables
-(2.5(d-5))+65=0
We calculate terms in parentheses: -(2.5(d-5)), so:We get rid of parentheses
2.5(d-5)
We multiply parentheses
2.5d-12.5
Back to the equation:
-(2.5d-12.5)
-2.5d+12.5+65=0
We add all the numbers together, and all the variables
-2.5d+77.5=0
We move all terms containing d to the left, all other terms to the right
-2.5d=-77.5
d=-77.5/-2.5
d=+31
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