You mean the expression of (1/2*(n*l)+1/2)*(k[blue]+ak[d])+(1-1/2*(n*l)+1/2)*(k[yellow]+bk[d])?
That's actually the wrong way to express it. Try blend(1/2*(n*l)+1/2,k[blue]+ak[d],k[yellow]+bk[d]), much simpler once the common blend factor is scaled out and the blending converted to function form.
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