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x in (-oo:+oo)
(1/3)*x-p+7 = 3*p // - 3*p
(1/3)*x-p-(3*p)+7 = 0
(1/3)*x-p-3*p+7 = 0
1/3*x-4*p+7 = 0 // - 7-4*p
1/3*x = -(7-4*p) // : 1/3
x = (-(7-4*p))/1/3
x = -3*(7-4*p)
x = -3*(7-4*p)
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