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