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19.97-11.3d=-15.2d-19.81
We move all terms to the left:
19.97-11.3d-(-15.2d-19.81)=0
We get rid of parentheses
-11.3d+15.2d+19.81+19.97=0
We add all the numbers together, and all the variables
3.9d+39.78=0
We move all terms containing d to the left, all other terms to the right
3.9d=-39.78
d=-39.78/3.9
d=-10+0.78/3.9
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