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R in (-oo:+oo)
(3*R)/4-(4/5) = 7/10 // - 7/10
(3*R)/4-(4/5)-(7/10) = 0
(3*R)/4-4/5-7/10 = 0
3/4*R-3/2 = 0 // + 3/2
3/4*R = 3/2 // : 3/4
R = 3/2/3/4
R = 2
R = 2
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