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x in (-oo:+oo)
(1/84)*x+3/7 = p // - p
(1/84)*x-p+3/7 = 0
1/84*x-p+3/7 = 0 // - 3/7-p
1/84*x = -(3/7-p) // : 1/84
x = (-(3/7-p))/1/84
x = 84*(p-3/7)
x = 84*(p-3/7)
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