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130+31.67d=500
We move all terms to the left:
130+31.67d-(500)=0
We add all the numbers together, and all the variables
31.67d-370=0
We move all terms containing d to the left, all other terms to the right
31.67d=370
d=370/31.67
d=11+13.269938650307/19.429447852761
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