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155=31(d-971)
We move all terms to the left:
155-(31(d-971))=0
We calculate terms in parentheses: -(31(d-971)), so:We get rid of parentheses
31(d-971)
We multiply parentheses
31d-30101
Back to the equation:
-(31d-30101)
-31d+30101+155=0
We add all the numbers together, and all the variables
-31d+30256=0
We move all terms containing d to the left, all other terms to the right
-31d=-30256
d=-30256/-31
d=+976
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