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