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r in (-oo:+oo)
900-(16*r)-(4*r) = 200/1 // - 200/1
900-(16*r)-(4*r)-(200/1) = 0
900-16*r-4*r-200 = 0
700-20*r = 0 // - 700
-20*r = -700 // : -20
r = -700/(-20)
r = 35
r = 35
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