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p in (-oo:+oo)
(3/10)*p = -9/8 // + -9/8
(3/10)*p-(-9/8) = 0
(3/10)*p+9/8 = 0
3/10*p+9/8 = 0 // - 9/8
3/10*p = -9/8 // : 3/10
p = -9/8/3/10
p = -15/4
p = -15/4
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