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r in (-oo:+oo)
(1/4)*r = 18-22 // - 18-22
(1/4)*r-18+22 = 0
1/4*r+4 = 0 // - 4
1/4*r = -4 // : 1/4
r = -4/1/4
r = -16
r = -16
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