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