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v in (-oo:+oo)
2.1/7.7 = v/8.8 // - v/8.8
2.1/7.7-(v/8.8) = 0
2.1/7.7-0.11363636*v = 0
0.27272727-0.11363636*v = 0 // - 0.27272727
-0.11363636*v = -0.27272727 // : -0.11363636
v = -0.27272727/(-0.11363636)
v = 2.40000005
v = 2.40000005
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