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r in (-oo:+oo)
r/3.5 = 7 // - 7
r/3.5-7 = 0
0.28571429*r-7 = 0 // + 7
0.28571429*r = 7 // : 0.28571429
r = 7/0.28571429
r = 24.49999963
r = 24.49999963
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