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170=10d+20
We move all terms to the left:
170-(10d+20)=0
We get rid of parentheses
-10d-20+170=0
We add all the numbers together, and all the variables
-10d+150=0
We move all terms containing d to the left, all other terms to the right
-10d=-150
d=-150/-10
d=+15
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