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p in (-oo:+oo)
(3/10)*p = -9/4 // + -9/4
(3/10)*p-(-9/4) = 0
(3/10)*p+9/4 = 0
3/10*p+9/4 = 0 // - 9/4
3/10*p = -9/4 // : 3/10
p = -9/4/3/10
p = -15/2
p = -15/2
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