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18-18d=-14-20d
We move all terms to the left:
18-18d-(-14-20d)=0
We add all the numbers together, and all the variables
-18d-(-20d-14)+18=0
We get rid of parentheses
-18d+20d+14+18=0
We add all the numbers together, and all the variables
2d+32=0
We move all terms containing d to the left, all other terms to the right
2d=-32
d=-32/2
d=-16
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