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p in (-oo:+oo)
0.2*p+0.75 = (-1/5)*p-(3/4) // - (-1/5)*p-(3/4)
0.2*p-((-1/5)*p)+3/4+0.75 = 0
0.2*p+(1/5)*p+3/4+0.75 = 0
0.4*p+1.5 = 0 // - 1.5
0.4*p = -1.5 // : 0.4
p = -1.5/0.4
p = -3.75
p = -3.75
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