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r in (-oo:+oo)
2*(7/8) = (3/4)*r // - (3/4)*r
2*(7/8)-((3/4)*r) = 0
(-3/4)*r+2*(7/8) = 0
7/4-3/4*r = 0 // - 7/4
-3/4*r = -7/4 // : -3/4
r = -7/4/(-3/4)
r = 7/3
r = 7/3
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