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x in (-oo:+oo)
P = 3*x-(12/4) // - 3*x-(12/4)
P-(3*x)+12/4 = 0
P-3*x+12/4 = 0
P-3*x+3 = 0 // - P+3
-3*x = -(P+3) // : -3
x = (-(P+3))/(-3)
x = (P+3)/3
x = (P+3)/3
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