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2d-15.8=-3.7+d
We move all terms to the left:
2d-15.8-(-3.7+d)=0
We add all the numbers together, and all the variables
2d-(d-3.7)-15.8=0
We get rid of parentheses
2d-d+3.7-15.8=0
We add all the numbers together, and all the variables
d-12.1=0
We move all terms containing d to the left, all other terms to the right
d=12.1
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