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r in (-oo:+oo)
3/8-((10/7)*r) = -187/8 // + -187/8
3/8-((10/7)*r)-(-187/8) = 0
(-10/7)*r+3/8+187/8 = 0
95/4-10/7*r = 0 // - 95/4
-10/7*r = -95/4 // : -10/7
r = -95/4/(-10/7)
r = 133/8
r = 133/8
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