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c in (-oo:+oo)
-(c/1.2)-6.8 = -2.9 // + 2.9
2.9-(c/1.2)-6.8 = 0
2.9-0.83333333*c-6.8 = 0
-0.83333333*c-3.9 = 0 // + 3.9
-0.83333333*c = 3.9 // : -0.83333333
c = 3.9/(-0.83333333)
c = -4.68000002
c = -4.68000002
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