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13d+90=51d-100
We move all terms to the left:
13d+90-(51d-100)=0
We get rid of parentheses
13d-51d+100+90=0
We add all the numbers together, and all the variables
-38d+190=0
We move all terms containing d to the left, all other terms to the right
-38d=-190
d=-190/-38
d=+5
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