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p in (-oo:+oo)
(-2.1/7)*p = -3 // + 3
(-2.1/7)*p+3 = 0
3-0.3*p = 0 // - 3
-0.3*p = -3 // : -0.3
p = -3/(-0.3)
p = 10
p = 10
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