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100/P = 0.5*Y-(50*i) // - 0.5*Y-(50*i)
100/P-(0.5*Y)+50*i = 0
100/P-0.5*Y+50*i = 0
100*P^-1-0.5*Y+50*i = 0
x naleu017Cy do R
x in (-oo:+oo)
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