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19=5+7d
We move all terms to the left:
19-(5+7d)=0
We add all the numbers together, and all the variables
-(7d+5)+19=0
We get rid of parentheses
-7d-5+19=0
We add all the numbers together, and all the variables
-7d+14=0
We move all terms containing d to the left, all other terms to the right
-7d=-14
d=-14/-7
d=+2
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