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2(75-d)=315
We move all terms to the left:
2(75-d)-(315)=0
We add all the numbers together, and all the variables
2(-1d+75)-315=0
We multiply parentheses
-2d+150-315=0
We add all the numbers together, and all the variables
-2d-165=0
We move all terms containing d to the left, all other terms to the right
-2d=165
d=165/-2
d=-82+1/2
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