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75.3=45.8(1+2d)
We move all terms to the left:
75.3-(45.8(1+2d))=0
We add all the numbers together, and all the variables
-(45.8(2d+1))+75.3=0
We calculate terms in parentheses: -(45.8(2d+1)), so:We get rid of parentheses
45.8(2d+1)
We multiply parentheses
91.6d+45.8
Back to the equation:
-(91.6d+45.8)
-91.6d-45.8+75.3=0
We add all the numbers together, and all the variables
-91.6d+29.5=0
We move all terms containing d to the left, all other terms to the right
-91.6d=-29.5
d=-29.5/-91.6
d=19.666666666667/61.066666666667
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