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-13=2d/4
We move all terms to the left:
-13-(2d/4)=0
We add all the numbers together, and all the variables
-(+2d/4)-13=0
We get rid of parentheses
-2d/4-13=0
We multiply all the terms by the denominator
-2d-13*4=0
We add all the numbers together, and all the variables
-2d-52=0
We move all terms containing d to the left, all other terms to the right
-2d=52
d=52/-2
d=-26
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