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x in (-oo:+oo)
r = (1/3)*d*(60-t) // - (1/3)*d*(60-t)
r-((1/3)*d*(60-t)) = 0
(-1/3)*d*(60-t)+r = 0
r-1/3*d*(60-t) = 0
r-1/3*d*(60-t) = 0
1/3*d*t-20*d+r = 0
1/3*d*t-20*d+r = 0
x belongs to the empty set
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