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x in (-oo:+oo)
x = (660-p)/198 // - (660-p)/198
x-((660-p)/198) = 0
(-1*(660-p))/198+x = 0
(-1*(660-p))/198+(198*x)/198 = 0
198*x-1*(660-p) = 0
p+198*x-660 = 0
(p+198*x-660)/198 = 0
(p+198*x-660)/198 = 0 // * 198
p+198*x-660 = 0
p+198*x-660 = 0 // - p-660
198*x = -(p-660) // : 198
x = (-(p-660))/198
x = (660-p)/198
x = (660-p)/198
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