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r in (-oo:+oo)
(2/9)*r+4.3 = 3.7 // - 3.7
(2/9)*r-3.7+4.3 = 0
2/9*r+0.6 = 0 // - 0.6
2/9*r = -0.6 // : 2/9
r = -0.6/2/9
r = -2.70000003
r = -2.70000003
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