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c in (-oo:+oo)
(2/3)*(c-2)+(5/9)*c+1/9 = (2/9)*(5*c+5) // - (2/9)*(5*c+5)
(2/3)*(c-2)-((2/9)*(5*c+5))+(5/9)*c+1/9 = 0
(2/3)*(c-2)+(-2/9)*(5*c+5)+(5/9)*c+1/9 = 0
2/3*(c-2)-2/9*(5*c+5)+(5*c)/9+1/9 = 0
(2/3*9*(c-2))/9+(-2/9*9*(5*c+5))/9+(5*c)/9+1/9 = 0
2/3*9*(c-2)-2/9*9*(5*c+5)+5*c+1 = 0
5*c-4*c-22+1 = 0
c-22+1 = 0
c-21 = 0
(c-21)/9 = 0
(c-21)/9 = 0 // * 9
c-21 = 0
c-21 = 0 // + 21
c = 21
c = 21
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