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b in (-oo:+oo)
b/7.8 = -2.15 // + 2.15
b/7.8+2.15 = 0
0.12820513*b+2.15 = 0 // - 2.15
0.12820513*b = -2.15 // : 0.12820513
b = -2.15/0.12820513
b = -16.76999977
b = -16.76999977
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