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5(10+20+30-30-20-10)=d
We move all terms to the left:
5(10+20+30-30-20-10)-(d)=0
We add all the numbers together, and all the variables
-d+50=0
We add all the numbers together, and all the variables
-1d+50=0
We move all terms containing d to the left, all other terms to the right
-d=-50
d=-50/-1
d=+50
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