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18d-(-5d)+(-19d)-13d+11d=-12
We move all terms to the left:
18d-(-5d)+(-19d)-13d+11d-(-12)=0
We add all the numbers together, and all the variables
16d-(-5d)+(-19d)+12=0
We get rid of parentheses
16d+5d-19d+12=0
We add all the numbers together, and all the variables
2d+12=0
We move all terms containing d to the left, all other terms to the right
2d=-12
d=-12/2
d=-6
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