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42=-2d+5
We move all terms to the left:
42-(-2d+5)=0
We get rid of parentheses
2d-5+42=0
We add all the numbers together, and all the variables
2d+37=0
We move all terms containing d to the left, all other terms to the right
2d=-37
d=-37/2
d=-18+1/2
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