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260=16+4d/13
We move all terms to the left:
260-(16+4d/13)=0
We add all the numbers together, and all the variables
-(4d/13+16)+260=0
We get rid of parentheses
-4d/13-16+260=0
We multiply all the terms by the denominator
-4d-16*13+260*13=0
We add all the numbers together, and all the variables
-4d+3172=0
We move all terms containing d to the left, all other terms to the right
-4d=-3172
d=-3172/-4
d=+793
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