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x in (-oo:+oo)
10 = (3.91-x)/3.91 // - (3.91-x)/3.91
10-((3.91-x)/3.91) = 0
10-0.25575448*(3.91-x) = 0
10-0.25575448*(3.91-x) = 0
0.25575448*x+8.9999999832 = 0
0.25575448*x+8.9999999832 = 0
0.25575448*x+8.9999999832 = 0 // - 8.9999999832
0.25575448*x = -8.9999999832 // : 0.25575448
x = -8.9999999832/0.25575448
x = -35.18999934
x = -35.18999934
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