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r in (-oo:+oo)
(10/7)*r+3 = 18 // - 18
(10/7)*r-18+3 = 0
10/7*r-18+3 = 0 // - 3-18
10/7*r = -(3-18) // : 10/7
r = (-(3-18))/10/7
r = 7/10*(18-3)
r = 7/10*(18-3)
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