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x in (-oo:+oo)
4*(t+20) = (1/5)*(20*n+400) // - (1/5)*(20*n+400)
4*(t+20)-((1/5)*(20*n+400)) = 0
4*(t+20)+(-1/5)*(20*n+400) = 0
4*(t+20)-1/5*(20*n+400) = 0
4*(t+20)-1/5*(20*n+400) = 0
4*t-4*n = 0
4*t-4*n = 0
x belongs to the empty set
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