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R in (-oo:+oo)
R/3.5 = 6.3/4.9 // - 6.3/4.9
R/3.5-(6.3/4.9) = 0
R/3.5-1.28571429 = 0
0.28571429*R-1.28571429 = 0 // + 1.28571429
0.28571429*R = 1.28571429 // : 0.28571429
R = 1.28571429/0.28571429
R = 4.49999995
R = 4.49999995
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