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c in (-oo:+oo)
2/7 = 0.2*(c-1) // - 0.2*(c-1)
2/7-(0.2*(c-1)) = 0
2/7-0.2*(c-1) = 0
(-0.2*7*(c-1))/7+2/7 = 0
2-0.2*7*(c-1) = 0
3.4-1.4*c = 0
(3.4-1.4*c)/7 = 0
(3.4-1.4*c)/7 = 0 // * 7
3.4-1.4*c = 0
3.4-1.4*c = 0 // - 3.4
-1.4*c = -3.4 // : -1.4
c = -3.4/(-1.4)
c = 2.42857143
c = 2.42857143
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