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-15+20=19d+7
We move all terms to the left:
-15+20-(19d+7)=0
We add all the numbers together, and all the variables
-(19d+7)+5=0
We get rid of parentheses
-19d-7+5=0
We add all the numbers together, and all the variables
-19d-2=0
We move all terms containing d to the left, all other terms to the right
-19d=2
d=2/-19
d=-2/19
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