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w in (-oo:+oo)
6.6/1.2 = w/4.2 // - w/4.2
6.6/1.2-(w/4.2) = 0
6.6/1.2-0.23809524*w = 0
5.5-0.23809524*w = 0 // - 5.5
-0.23809524*w = -5.5 // : -0.23809524
w = -5.5/(-0.23809524)
w = 23.09999982
w = 23.09999982
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