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x in (-oo:+oo)
3.6/8.7 = x/2.6 // - x/2.6
3.6/8.7-(x/2.6) = 0
3.6/8.7-0.38461538*x = 0
0.4137931-0.38461538*x = 0 // - 0.4137931
-0.38461538*x = -0.4137931 // : -0.38461538
x = -0.4137931/(-0.38461538)
x = 1.07586207
x = 1.07586207
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