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-8d-7=-15-6d
We move all terms to the left:
-8d-7-(-15-6d)=0
We add all the numbers together, and all the variables
-8d-(-6d-15)-7=0
We get rid of parentheses
-8d+6d+15-7=0
We add all the numbers together, and all the variables
-2d+8=0
We move all terms containing d to the left, all other terms to the right
-2d=-8
d=-8/-2
d=+4
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