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-15.9d+12.35=-16.2d+6.98
We move all terms to the left:
-15.9d+12.35-(-16.2d+6.98)=0
We get rid of parentheses
-15.9d+16.2d-6.98+12.35=0
We add all the numbers together, and all the variables
0.3d+5.37=0
We move all terms containing d to the left, all other terms to the right
0.3d=-5.37
d=-5.37/0.3
d=-17+0.27/0.3
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