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R in (-oo:+oo)
(1/4)*R = 19-22 // - 19-22
(1/4)*R-19+22 = 0
1/4*R+3 = 0 // - 3
1/4*R = -3 // : 1/4
R = -3/1/4
R = -12
R = -12
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