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6-7d=-5d
We move all terms to the left:
6-7d-(-5d)=0
We get rid of parentheses
-7d+5d+6=0
We add all the numbers together, and all the variables
-2d+6=0
We move all terms containing d to the left, all other terms to the right
-2d=-6
d=-6/-2
d=+3
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