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r in (-oo:+oo)
(1/4)*r-((-1/2)*r) = -9 // + 9
(1/4)*r-((-1/2)*r)+9 = 0
(1/4)*r+(1/2)*r+9 = 0
3/4*r+9 = 0 // - 9
3/4*r = -9 // : 3/4
r = -9/3/4
r = -12
r = -12
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