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31=2(3.14)d
We move all terms to the left:
31-(2(3.14)d)=0
We calculate terms in parentheses: -(2(3.14)d), so:We add all the numbers together, and all the variables
2(3.14)d
We multiply parentheses
6.28d
Back to the equation:
-(6.28d)
-(+6.28d)+31=0
We get rid of parentheses
-6.28d+31=0
We move all terms containing d to the left, all other terms to the right
-6.28d=-31
d=-31/-6.28
d=4+3.1276595744681/3.3404255319149
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