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375+125d=275+175d
We move all terms to the left:
375+125d-(275+175d)=0
We add all the numbers together, and all the variables
125d-(175d+275)+375=0
We get rid of parentheses
125d-175d-275+375=0
We add all the numbers together, and all the variables
-50d+100=0
We move all terms containing d to the left, all other terms to the right
-50d=-100
d=-100/-50
d=+2
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