I Heat Equation Problem

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I’ve attached an image of a solved problem related to the heat equation.

Can somebody explain the -c + 3d = 0 comes from? I’m having trouble following the work shown.
 

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phinds

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Hard to say since your image is way too small to read
 
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Perfect thermal contact occurs at x=1, so the flow coming from the right is equal to the flow coming from the left. Now recall that the flow is given by ##\phi=-K_0\frac{\partial u}{\partial x}##, that is Fourier's law. The derivatives on both sides are constants as it's shown on your work so we're just left with: $$K_{1}\dfrac{\partial u_1}{\partial x} = K_{2}\dfrac{\partial u_2}{\partial x} \\ -c = -3d \\ -c+3d=0$$ I took the liberty to introduce some notation since it's a little confusing in your solution, but essentially all you have to do is substitute the conductivities given in the exercise and the solutions you found for u.
 

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