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r in (-oo:+oo)
r/12 = 1.9/10 // - 1.9/10
r/12-(1.9/10) = 0
r/12-0.19 = 0
1/12*r-0.19 = 0 // + 0.19
1/12*r = 0.19 // : 1/12
r = 0.19/1/12
r = 2.28000009
r = 2.28000009
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