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p in (-oo:+oo)
(5/3)*(p+1) = 21/20 // - 21/20
(5/3)*(p+1)-(21/20) = 0
(5/3)*(p+1)-21/20 = 0
5/3*(p+1)-21/20 = 0
(5/3*20*(p+1))/20-21/20 = 0
5/3*20*(p+1)-21 = 0
100/3*p+37/3 = 0
(100/3*p+37/3)/20 = 0
(100/3*p+37/3)/20 = 0 // * 20
100/3*p+37/3 = 0
100/3*p+37/3 = 0 // - 37/3
100/3*p = -37/3 // : 100/3
p = -37/3/100/3
p = -37/100
p = -37/100
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